Why the percentage retainer scales down with spend

The pricing model in this industry is broken in two predictable ways. Hourly billing that has no relationship to outcomes. Or flat retainers that punish small accounts and underprice large ones. I tried both for years before settling on what I run now. The model is simple: percentage of monthly ad spend, scaling down as the spend grows. A small account pays a higher percentage. A large account pays a lower percentage. The exact numbers I do not publish, because every account has different complexity and the conversation is better had on a call. But the principle is worth explaining, because the structure tells you something about how a studio actually works. A small account does not require less work. It requires the same work, sometimes more. Setting up tracking properly takes the same hours whether the account spends $2k a month or $50k. Auditing search terms takes the same hours. Writing strategy takes the same hours. The difference is that a small account cannot afford the same retainer as a large account. So the percentage has to be higher to make the work financially viable. A large account requires less work per dollar of spend, not because it is easier, but because the leverage is different. Optimising one campaign for a $50k account moves more revenue than optimising one campaign for a $2k account. The studio system, once it is in place, scales without scaling the cost to the client linearly. Frank watches every account at the same fixed cost. The team executes at roughly the same hourly rate regardless of account size. The strategy work is similar in volume but produces vastly different financial outcomes at scale. So a $2k account paying 20 percent and a $50k account paying 8 percent are both paying for the same studio. The smaller account needs to absorb a higher proportion to cover the fixed cost of running a real operation. The larger account benefits from the leverage of scale. The advantage of this model over hourly is that incentives are aligned. If I do good work and the client scales spend, I make more money. If I do bad work and the client cuts spend, I make less. There is no way to inflate hours to pad an invoice. The work either produces more revenue or it does not. The advantage over flat retainers is that growth is shared. A flat $2,000 a month retainer means the agency has no upside if the client triples their ad spend. The agency might quietly let the work decline because the contract is profitable enough. With a percentage model, when the client grows, I grow. When they pull back, I pull back with them. It is honest. A few clients have asked why I do not just charge hourly. The honest answer is that hourly billing makes me a vendor instead of an operator. Vendors are paid for time. Operators are paid for outcomes. Vendors get squeezed every time the client wants more for less. Operators have a structural alignment with the account. The other honest answer is that hourly billing creates a perverse incentive on my side. Every minute I save through automation, tooling, or experience is a minute I cannot bill. If I build Frank to watch the account so I do not have to manually log in three times a day, hourly billing punishes me for that. Percentage of spend rewards it. The faster and better I run the system, the more accounts I can handle, the more revenue I make. Some agencies still charge hourly because they have not figured out how to price the value of their system. They are charging for time because that is the only thing they can quantify. The studio model lets me charge for the system itself. For prospective clients, the takeaway is this. If an agency is charging you hourly, ask them what you are paying for that scales. If the answer is "more hours when we scale spend", that is not aligned with your interests. If the answer is "the same operating system regardless of spend", they should be charging you a percentage of spend, because that is what the leverage looks like.