The math nobody shows the client
A $3,500 monthly retainer represents roughly 20 to 30 billable hours at agency rates once overhead and margin are applied. Sounds like a lot of attention. Now subtract the standing weekly call, the internal account review, the monthly report assembly, and the time to answer emails.
What remains for actual campaign work — building, testing, optimizing, writing new creative — is frequently under half.
Where the rest goes
Not into anyone’s pocket unfairly. It goes into the cost structure of a service business: office, software licenses, senior oversight, new business effort, and the layer of coordination that any multi-client shop requires.
You are buying a share of an organization. That is a legitimate purchase. It is just worth knowing that is what it is.
The fixed-fee trap in both directions
When your spend is small relative to the retainer, you are overpaying — the fee dominates the budget. When your spend grows large, a fixed retainer becomes a bargain, which is exactly when most agencies move you to a percentage.
The structure is designed so the provider is never on the wrong side of the trade.
What to do about it
Two options. Renegotiate to outcome-linked or usage-linked pricing, so the fee tracks the work rather than your growth. Or move execution to a model where the same multi-channel work costs a fraction of a retainer and you keep the strategy in-house, where it usually belonged anyway.
Either way, the first move is the same: get the annual number on one line. Monthly retainers are easy to approve. $42,000 is easy to think about.