Four practical alternatives exist: a flat monthly retainer, a per-product tier, a profit share above an agreed floor, and an hourly or project fee for defined work. A flat retainer is the strongest default, because it is the only structure where nobody earns more when your advertising budget goes up.
The short version
- Twelve percent of a $20,000 monthly ad budget is $2,400. That same money buys a five-product flat retainer with no incentive attached to your spending.
- Per-product tiers price the work, not the money moved. The fee rises when scope rises, which is the honest trigger.
- Profit share belongs above a floor. We use it only above $50,000 per month in profit, at 10 to 20 percent, with no fixed fee underneath.
- Hourly suits work with an end date. A catalog rebuild finishes. Ongoing management does not.
- One question separates all four: how many brands does one account manager carry? Ours carry about 1.4.
Why the percentage model survives
It survives because it is easy to sell and easy to invoice. It sounds performance-linked, it grows automatically as the account grows, and it lets an agency quote you without doing any analysis first. None of those reasons are about your margin.
The mechanic underneath is simple. Your goal is the lowest cost of customer acquisition you can reach. Their revenue is a function of how much you spend. Those two lines diverge on the exact day the honest recommendation is to cut a budget, and that day arrives on almost every account eventually.
The four alternatives, side by side
| Alternative | What you are paying for | Who carries budget risk | Best fit |
|---|---|---|---|
| Flat monthly retainer | A defined scope of work | The agency, since effort moves and the fee does not | Brands below about $50,000 monthly profit |
| Per-product tier | The number of products managed | Shared, and scope changes stay visible | Catalogs that grow one ASIN at a time |
| Profit share above a floor | A share of profit over an agreed level | The agency, heavily | Established brands past the floor |
| Hourly or project fee | Named deliverables with a finish line | You, if the scope is loose | Audits, rebuilds, market entry work |
Flat monthly retainer
You pay one number every month whatever happens. At Flapen that number is $800 for a single product and $2,400 for five, and every tier includes the whole service set with no commission and no revenue share.
The honest weakness of a flat fee is that some months you get a bargain and some months we do. I accept that trade because of what it removes: when I tell a client to halve a budget, my invoice does not move.
Per-product tiering
A variant of the flat fee where price steps up with catalog size. It works well for brands adding products deliberately, because the cost of the next ASIN is known before you commit to inventory. Ask whether a tier change requires a new contract or a new line on the invoice.
Profit share above a floor
The agency takes a percentage of profit above an agreed level and nothing below it. This is the closest thing to genuine alignment, and it is also the easiest to argue about, because attribution is contested and profit is a calculation with many inputs.
We run it only above $50,000 per month in profit, at 10 to 20 percent. Below that line, a single bad inventory month swings the fee so hard that one side always feels cheated.
Hourly or project fees
Correct for anything with a boundary: a listing audit, a variation family rebuild, a translation pass for a new marketplace. Wrong for continuous work, because nobody can forecast the hours and the incentive quietly rewards slow work.
The decision rule, in four steps
- Calculate your current percentage fee in dollars. Take last quarter's average monthly ad spend and multiply. Compare that single number against a flat quote.
- Ask what happens at half the budget. If the agency's answer includes a fee floor, the model was never really variable.
- Check the profit floor. If someone offers profit share on a brand doing $12,000 a month, they either have not modeled it or they plan to charge a retainer underneath anyway.
- Ask how many brands the person doing your work carries. A percentage model funds volume, not attention. We hold about 1.4 brands per operator, and that ratio is the reason a flat fee works for us.
What most agencies will not tell you when you ask to switch
Switching models mid-relationship is usually possible and almost never offered. A percentage agreement rarely has a clause preventing renegotiation, but nobody volunteers a change that reduces their own revenue.
The second thing: a low percentage is not automatically a good deal. Ten percent of a bloated budget costs more than a flat fee attached to a disciplined one, and the bloated budget is the more expensive problem by far. Compare the total, not the rate.
Related answers
- Amazon agency pricing models explained
- Fixed fee vs rev share for Amazon agencies
- Alternatives to flat-fee PPC for seasonal brands
- Fair Amazon agency pricing models
- Amazon agency pricing and economics: the complete guide
Every tier and inclusion is published, so you can run this comparison yourself at Flapen.
