How I Use a Return Model to Check Whether an Agency Fee Makes Sense

Before trying to persuade a prospect to buy, I want to know whether the service could make financial sense for that business. Two prospects can receive the same price and face very different economics because their margins, customer value and ability to turn opportunities into sales differ.

I use the calculation as part of a consultative conversation. Ask about the business, work through conservative inputs together and see whether there is room for both parties. The figures in the examples are assumptions for the exercise, not a promise of the sales a new client will achieve.

Start with the prospect’s business instead of a fixed pitch

The opening I suggested asks permission to understand whether the service would work financially for both sides. I want to know what kind of business it is, whom it sells to, whether the audience can be reached through the proposed channel and what it charges.

That changes the meeting from simply announcing a retainer to testing whether the buyer has the economics to support it. I suggested screen-sharing a document and walking through conservative values, rather than treating the price as meaningful without context.

In email marketing, more sales are not all available to pay the agency

In my first email-marketing example, I assumed $32,000 in additional monthly sales at a 40% product margin, with a $3,000 agency fee. Applying that margin leaves $12,800 from the additional sales before the agency fee is deducted. The product has costs; the sales total is not all money the buyer can keep.

Client Ascension calculation note: $12,800 divided by $3,000 is about 4.3. In this illustration that is the stated margin amount before the agency fee divided by the fee, not net ROI after all costs. The example does not disclose a complete business profit calculation.

The contrasting prospect had an assumed $5,500 in additional monthly sales and a 30% product margin, leaving $1,650 before the same $3,000 fee. Even those assumed sales would not leave enough at that margin to cover the agency charge.

For lead generation, work through the cost of obtaining a customer

I compared a service priced at $300 a month with one priced at $8,000 a month, each with an assumed six-month customer relationship. Those inputs produce $1,800 and $48,000 in lifetime revenue respectively. They do not establish that either prospect has the same fulfillment costs or cash-collection schedule.

Both examples assumed that one in five qualified calls became a customer. At $400 per qualified call, five calls cost $2,000. That cost is already above the lower-value prospect’s assumed $1,800 lifetime revenue, before allowing for delivery costs.

Client Ascension calculation note: $48,000 in lifetime revenue less $2,000 in call fees leaves $46,000 before fulfillment and other costs. That remainder is not verified net profit or cash collected immediately. The closing rate and customer duration are assumed inputs, not guaranteed performance.

Client Ascension related reading: the LTV screening guide examines customer value, delivery margin, acquisition cost and cash timing. It expands the prospect-selection questions behind this simplified call-fee model.

A failed calculation can be a prospect-fit problem

My recommendation was not to keep cutting the price so that it fit any business. I preferred speaking with prospects whose customer value could support the service. In these examples, the same agency price had a different meaning for a different buyer.

The model also gives both people something specific to discuss: whether the revenue assumption is realistic, what margin applies and how opportunities become sales. Conservative values matter because the purpose is to assess the service, not manufacture certainty with optimistic inputs.

Client Ascension related reading: Alex’s fractional CFO case study describes a professional-services offer, consistent outreach, a client’s long sales cycle and business systems. It is a separate operator story, not proof of the assumptions in these examples.

Keep the financial model and the actual result separate

A calculation can explain why an offer may be worth considering for a particular prospect. It still depends on delivering the assumed additional sales or qualified calls and on the client’s actual economics. The document belongs in the sales conversation as a way to examine those inputs.

Client Ascension related reading: the economic guide distinguishes acquisition cost, lifetime receipts, fulfillment costs and payback timing. It offers a broader view of why a lifetime revenue figure is not the same as immediate profit.

Adapted by Client Ascension with AI assistance from Daniel Fazio's lesson. The first-person narrative follows the source speaker’s account. Watch the original video