Founders evaluating an operating partner usually start with the fee, because the fee is the only number on the table. Opsist's is published: ten percent of topline revenue, subject to a monthly minimum, with participation at exit. That number is easy to react to and easy to misjudge, because it is compared against nothing. The comparison that matters is against what the engagement replaces.
What actually gets replaced
In a founder-led business between one and ten million in revenue, the work an operating bench absorbs is rarely one line item. It is a fractional finance function that never quite closes on time, a part-time operations hire who reports to the founder, two or three vendors each owning a slice of reporting, and a meaningful share of the founder's own week spent being the integration layer between all of them. Each piece looks affordable. The total is almost never added up.
The substitution test, in three steps
- 01
List the absorbed cost
Roles, contractors, vendors and tools the engagement would absorb or replace, at their fully loaded cost. Include the founder's hours at an honest rate.
- 02
Compare against the fee
The fee should be smaller than the cost it replaces. If it is not, the economics do not work and the conversation should stop there.
- 03
Then weigh the upside
Only after substitution clears does the value-creation case matter: EBITDA quality, reporting a buyer can underwrite, and a business that runs without the founder.
This framing cuts both ways, and it should. There are businesses where the replaced cost is genuinely smaller than the fee, where the founder's hours are not the constraint, or where the company is simply too early. The right answer in those cases is no, and a credible operating partner should be willing to say it. The economics question is not a sales objection to overcome. It is the first fit test, and it protects both sides.