Managed vs Self-Service Advertising: Should You Hire an Agency?

The short answer

If you are spending under about $2,000 a month on one simple channel, run it yourself. At that level a managed service takes 20-25% of your spend in fees, and a fifth of a small budget is a lot to pay for management of a campaign you could plausibly run in a few hours a month.

Hire someone when the complexity — not the budget — exceeds what you can handle. Multiple channels, media you cannot buy without a vendor relationship, or an account big enough that a 15% fee is cheaper than the mistakes.

You should read the rest of this page knowing that we are the managed option. We have an obvious interest in your answer being "hire an agency." So every number below is cited, and the most important one argues against us.

What agencies actually charge

The industry standard for managing advertising is 10-20% of monthly ad spend, and the percentage moves inversely to the budget — the smaller your spend, the bigger the bite:

The median US agency retainer is around $3,000 a month. Many agencies also set a minimum fee, which is why a $1,500 budget frequently attracts a $500-plus charge — about a third of the money.

Sit with the top row for a moment. At $2,000 a month in spend, a 20% fee is $400. That $400 is not buying ads. For an agency to be worth it at that level, it has to make your campaign perform at least 25% better than you would have managed on your own — just to break even. That is a high bar, and for a single well-set-up Google Ads campaign, plenty of business owners clear it themselves.

The corollary is also true and worth knowing: a fee of 5% of spend or less is a red flag. Nobody can afford to do real work at that margin — it usually signals set-and-forget management, where your campaign is switched on and then ignored.

When you should run it yourself

Run your own ads if all of these are true:

• Your budget is small (roughly under $2,000/month) — the fee is simply too large a share of it.
• You are buying one or two self-service channels. Google Ads, Meta, and TikTok are genuinely designed for you to use without help. They want your money; the interfaces are built for self-service.
• Your offer is simple. One service, one location, one clear conversion.
• You have a few hours a month and some patience for the learning curve.

For a solo plumber, a single-location restaurant, or a small retailer, a well-built search campaign plus a Google Business Profile can be run by the owner. Advertising is not sorcery. It is a skill, and it is learnable, and anyone who tells you otherwise is selling something.

The real cost of DIY is not money, it is time and tuition. You will waste some budget learning. The question is whether that waste is smaller than the fee — at small spends, it very often is.

When managed genuinely earns its fee

1. The channels you cannot self-serve. This is the strongest and most concrete reason. You can open a Google Ads account tonight. You cannot open a radio account, and CTV, geofencing, streaming audio, and email deployments all run through vendor relationships with minimum buys attached. If your plan calls for those channels, "self-service" is not an option that exists — the choice is a managed buy or no buy.

2. Multi-channel coordination. One channel is manageable. Five channels — with different reporting, different attribution, different creative specs, and a budget to balance across them — is a job. The complexity is not linear.

3. Scale makes the fee shrink. At $25,000 a month, a 12% fee is $3,000 to manage $22,000 of media. Now the maths inverts: a modest improvement in performance is worth far more than the fee, and the cost of unmanaged mistakes is far higher than the cost of management.

4. Your time has a price. If you bill $150 an hour and campaign management takes eight hours a month, you have spent $1,200 of your own capacity to save $400. That is a bad trade, and it is invisible on the invoice.

5. Buying power and rate cards. Media bought through an agency with existing relationships is often bought better than media bought cold. (We would say that. Ask any agency to prove it with an actual rate card, and treat a refusal as an answer.)

The break-even test

Strip out the sales talk and it comes down to one line:

An agency is worth hiring when the improvement it delivers, plus the value of the time it gives you back, plus the media you could not otherwise buy, is worth more than its fee.

Make them answer three questions before you sign:

1. What is the fee, as a percentage of my spend? If they will not state it plainly, that is your answer.
2. What can you buy that I cannot buy myself? If the honest answer is "nothing," you are paying a premium for someone to press the same buttons you can press.
3. What will you tell me when it is not working? The only useful agency is one that will tell you to stop spending. If something is not working, you should hear it from them first.

What we actually recommend

We would rather you spent $1,500 a month well by yourself than $1,500 a month badly with us. If your budget is small and your plan is one channel, run it yourself — and come back when the plan gets complicated enough to be worth paying for, or when it needs media you cannot buy alone.

That is not modesty. It is that a client whose first $18,000 was largely eaten by fees does not stay a client.

Find out what your budget can actually support

Before you decide who should run it, find out what "it" should be. Run the free advertising budget calculator — no email required, no form, no call. Enter your goal, industry, market, and budget, and it returns a real channel allocation on real rate-card pricing. If it comes back with a single self-service channel, you have your answer, and you do not need us to execute it.

Every number it uses is sourced.

Related reading: How Much Should a Small Business Spend on Advertising? · How to Know If Your Advertising Is Working · How to Split Your Advertising Budget Across Channels