The cost of an e-commerce paid social agency includes more than its management fee. To compare proposals fairly, separate the agency retainer, the money paid to ad platforms, and creative production. Then check what each fee actually covers.
At Best Practice Media, we charge a retainer rather than a percentage of ad spend. Our fee does not automatically grow when your media budget grows. That matters because sometimes the strategic recommendation is to spend less: pause a weak offer, fix a conversion problem, or wait until inventory can support demand.
What are you actually paying for?
- Media spend: The budget paid to platforms such as Meta. This buys distribution; it is separate from the agency fee.
- Agency management: Strategy, campaign setup, optimization, analysis, communication, and the specific services listed in your agreement.
- Creative production: Concepts, copy, design, editing, shoots, or creator content. Ask which are included and which are additional.
- Supporting work: Tracking implementation, landing pages, product feeds, and reporting tools may have separate scopes.
A low management fee can become an expensive engagement if the work you need sits outside the proposal. An all-inclusive fee can also be poor value if you are buying services you will not use. Compare the scope before comparing the total.
Retainer versus percentage of ad spend
A percentage model links the management fee to the media budget. A retainer prices an agreed scope of work. Neither model tells you, on its own, whether an agency will make good decisions.
We prefer a retainer because it removes an automatic fee increase from the decision to increase spend. We want to be able to recommend a budget cut without that recommendation mechanically cutting our management fee.
A retainer still needs clear boundaries. If you add a platform, a market, or substantially more creative work, ask how a scope change would be handled. “Retainer-based” should not mean “everything, forever.”
How to calculate the full monthly investment
Use this starting point:
Total monthly investment = media spend + agency retainer + separately billed creative + other agreed costs.
For illustration only, imagine $12,000 in media spend, a $3,000 management retainer, and $2,000 in separate creative production. The monthly investment is $17,000. Those are hypothetical figures, not Best Practice Media rates or an industry pricing benchmark.
If a proposal shows only the $3,000 fee, it leaves out most of the cash you need to plan for. Ask about onboarding charges, minimum terms, software costs, and production commitments before you sign.
Can your margins support the investment?
Start with what remains from an order after discounts, product costs, payment fees, shipping subsidies, fulfillment, and an allowance for returns. That amount has to cover acquisition costs and contribute to overhead and profit.
Do not judge affordability using platform ROAS alone. Platform ROAS divides attributed revenue by media spend; it generally does not deduct the agency retainer or creative costs. A campaign can look healthy in Ads Manager while the full acquisition program costs more than the business can support.
Ask your prospective agency how it will connect platform reporting with store revenue, customer mix, and your margin assumptions. A useful proposal should make that conversation easier.
Seven questions to ask before comparing quotes
- Which platforms, markets, and accounts are included?
- How much new creative is included, and what counts as a revision?
- Who handles tracking, product feeds, and landing-page issues?
- What is the full cost in month one and in a typical ongoing month?
- What work would trigger an additional fee?
- How do you decide when to increase, hold, or cut media spend?
- What do we retain access to if the engagement ends?
What does Best Practice Media charge?
Best Practice Media uses retainer-based pricing. The scope of an engagement determines the proposal, so this article does not quote a universal monthly fee. Our paid social services cover areas such as strategy, creative, campaign management, tracking, and testing; your proposal should specify exactly which work is included.
If you are evaluating partners, bring your current media spend, target markets, creative resources, and business goals to the conversation. For the broader selection process, read how to choose a paid social agency for e-commerce.