Every month I get the same question in different forms: “How much should I invest in paid media?”, “Am I ready to hire someone?”, “Why isn’t it working?”. And the short answer is always the same: it depends on where your business is today, not on how much you’d like to spend.
This is the article I wish I had read before investing my first dollar in advertising. No magic formulas and no “invest 10% of revenue” thrown out without context. If you got here without knowing where to start, or you’re deciding whether to hire someone, this is for you.
The Real Trigger for Hiring Someone
The trigger is not “there’s spare cash in the account”. It’s operational: when you, as the owner, manager or whoever is running the campaigns, spend more than 4 to 6 hours a week trying to understand why your CPA went up, or when your spend is high enough to justify active optimization instead of just “turning it on and letting it run”.
There’s a simple test before any hire: do you know your CAC, average order value and LTV? If the answer is no, hiring an agency now means optimizing a game nobody knows whether you’re winning. First set up those three metrics, even in a simple spreadsheet, and then outsource the execution. Hiring earlier isn’t wrong in principle, but you’ll be paying to discover information you could have found yourself, for free, in two weeks of attention.
How Much to Invest, and When Things Start to Change
There’s no universal minimum, but there is a minimum for statistical significance, and that matters more than any rule of thumb.
On Google Ads or Meta Ads, if you don’t reach roughly 15 to 20 conversions a month at a target CPA that makes sense for your business, the algorithm barely leaves the learning phase, and you end up paying an “exploration tax” without ever reaching real optimization. In practice, that usually means:
- Local business, services, low or mid ticket: from about US$300–600 a month in media spend you already get a reliable signal.
- E-commerce or an operation that really wants to scale: around US$1,500–2,800 a month is where paid media becomes a growth channel instead of an experiment.
These are reference points, not rules: cost per click varies a lot by industry, market and competition (the figures above come from my work in MedellĂn and Colombia, where clicks are cheaper than in the US). Below those amounts, paid media is a hypothesis test, which is completely valid as long as you treat it as a test and not as the month’s survival bet.
How to Start Without Wasting Your First Budget
The order that works in practice is always the same:
- Define a real target metric: CPL or CPA, never “engagement” or “reach”.
- Run for 60 to 90 days with a minimum budget just to generate data, without changing the campaigns every week.
- Only then decide whether to scale or switch channels.
The most common mistake I see is jumping straight to step 3: testing everything at once, switching platforms every two weeks and burning the year’s budget in six weeks without collecting enough data to make any decision with confidence.
What Really Separates Amateurs from Professionals
There’s a figure that gets passed around a lot, “an amateur account wastes up to 20% of its budget”, almost always with no source behind it. It’s worth being skeptical of loose numbers, but the phenomenon is real and better documented than it seems. A WordStream study of 500 small-business Google Ads accounts found that fewer than half had conversion tracking set up correctly; in other words, almost half of the accounts had no way of knowing whether their spend was turning into results. In addition, several industry audits (biased, since they usually come from agencies that sell audits, so read them carefully) agree on a range of 20% to 40% waste in accounts that were never reviewed carefully, due to irrelevant search terms, poorly configured broad match and campaigns cannibalizing each other.
The point is not to memorize the percentage. It’s to understand where that money leaks, because that’s where a professional’s experience shows:
- Conversion tracking set up wrong (or missing). Without it, every later optimization is done blind: you could be turning off the campaign that sells the most because the system doesn’t know it sold.
- Unchecked broad match. Google keeps expanding the reach of search terms more aggressively. A professional reviews the search terms report regularly and cuts what doesn’t convert before it becomes a fixed cost.
- No living list of negative keywords. You don’t set it once and forget it: it’s ongoing maintenance, the most boring and least glamorous part of the job, and that’s exactly why amateurs skip it.
- Optimizing for clicks instead of the result that pays the bills. Amateurs look at CTR and reach because they look good in a report. Professionals look at CPA, close rate and, for custom products, what happens after the lead, because that’s where the business really makes or loses money.
In short: the difference rarely lies in “knowing how to use the platform”; anyone can create a campaign in 20 minutes today. It lies in knowing where to look every week, what to cut without fear, and what not to touch just because “it feels like something should be optimized”.
How to Choose a Professional or an Agency
Ask for cases with numbers, not pretty screenshots. Ask directly: “What was the CAC before and after?”, “How long did it take to get started from scratch?”. If the answer is vague, that’s a signal.
Be wary of anyone promising a return in 30 days for high-ticket products or long decision cycles. Usually it’s someone who doesn’t understand the buying journey, or who will sell you a premature conversion campaign just to show nice numbers in the first month’s report. Certifications (Google Partner, Meta Business Partner) are a basic filter, but on their own they don’t guarantee anything.
The Right Expectations
Paid media doesn’t create demand that doesn’t exist: it captures and accelerates existing or latent demand. If the product, the offer or the price aren’t aligned with the market, no “good” campaign will save it.
And one thing almost nobody warns you about: the first 60 to 90 days are always a learning and audience calibration phase. During that period, CPA is typically 30% to 50% worse than once it stabilizes. Anyone expecting profit in the first month bought the wrong expectation, not necessarily the wrong service.
Standard vs. Custom Products: the Difference Nobody Explains Well
This is the most practical point of all, and the one that causes the most frustration when ignored: a smartphone and made-to-measure curtains don’t play the same game, and treating them with the same budget and timeline rules is the recipe for concluding that “paid media doesn’t work”.
Standard product (phones, electronics, off-the-rack clothing): quick decision, price is the main comparison criterion and the funnel is short, days rather than weeks. CAC is predictable, and you can run direct conversion campaigns from day one, because the product already exists and the purchase doesn’t depend on a custom quote. Media spend is usually between 5% and 15% of revenue, focused on Shopping, Performance Max and remarketing.
Custom product or service (custom curtains, carpentry, projects, B2B): the decision depends on trust, the quote and the timeline. The cycle runs from weeks to months. A direct conversion campaign (“buy now”) usually fails, because there is no “now”; there’s a “send me a quote”. The right funnel is qualified lead generation plus nurturing: WhatsApp, remarketing, portfolio and social proof, not a direct checkout. The share of revenue is usually lower, between 3% and 8%, but cost per lead is higher, and the real CPA only shows up when you measure the close rate from quote to sale, not the cost of the lead on its own.
The classic mistake is measuring custom curtains with the smartphone rule: looking only at the cost per checkout conversion, when the real conversion happens outside the platform, in a quote closed over WhatsApp weeks later.
Payback Time: What to Really Expect
- Standard or impulse product: 30 to 60 days to get a reliable trend signal.
- Custom or B2B product: 90 to 180 days, because the sales cycle itself already takes that long.
The most common mistake of an impatient client is turning off the campaign in the second month thinking “it didn’t work”, when the leads from the first month are still being negotiated.
Is Brand Building Worth It for a Small Business?
Yes, and it’s underrated, especially in smaller markets, where word of mouth and name recognition matter more than in a saturated capital city. But branding for a small business isn’t an expensive institutional campaign. It’s visual consistency plus recurring social proof (testimonials, before-and-after, active presence) running in parallel with your performance strategy.
Businesses that only do performance are at the mercy of a CPA that rises over time, because they never build direct demand for the brand, meaning people searching for the business by name. Those that combine both manage to lower CAC within 12 to 18 months, because part of the traffic starts arriving organically or directly.
What Does “Mid-Sized Company” Really Mean? The Bogotá vs. MedellĂn Example
In Colombia, the official classification (Decree 957 of 2019) is based on revenue from ordinary activities and varies by sector: manufacturing, services or retail. That’s the “on paper” criterion. In practice, what changes between Bogotá and cities like MedellĂn is not absolute revenue, but the relative weight of that revenue in the local market. A company that is already a visible player in MedellĂn can be almost invisible in Bogotá, surrounded by much more competition.
That’s why I use a functional criterion instead of an accounting one: a local mid-sized company is a business that already has a structured operation (more than one location or a dedicated sales team) and runs more than one paid channel at the same time. In MedellĂn or other mid-sized cities, that usually shows up at much lower revenue, from roughly US$250,000 to 500,000 a year, than in Bogotá, where the same maturity comes later because competing for attention there costs more. The same logic applies to any large city versus a smaller one.
Who This Is For
If you’re deciding between paying very little to a “paid media guy” who promises the world, or waiting until you make millions to “deserve” strategic attention, neither extreme is the way. Serious paid media work happens in the middle: businesses that already know their numbers, are ready to operate with 60 to 90 days of discipline and understand that returns are a process, not the luck of one campaign.
If that’s you, message me on WhatsApp.