Media buying unit economics: calculating an affordable cost per FTD

You can only scale what is counted.

A campaign with a positive balance can become unprofitable after an increase in CPM or a fall in approval rate. Therefore, the media buyer needs not one indicator, but a small model of the unit economics.

Basic indicators

Cost per raw FTD = costs/all FTDs.

Cost per confirmed FTD = costs/confirmed FTD.

The second formula is especially important for CPA because it is the confirmed action that is associated with the payout.

illustrative example

Expenses are $5,000. The system recorded 70 FTDs, of which 55 were confirmed. CPA is a illustrative $120.

If you look only at raw FTD, the stock seems to be larger than it actually is.

What is the allowable price

You cannot assume that the maximum price of FTD is equal to the CPA rate. You need a margin for fluctuations: the cost of traffic, deviations, commissions and forecast errors. The more unstable the source, the more important this buffer is.

Scaling by step

Increase the budget so that after each step you can see if the economy has survived. If the budget is up 50% and the cost per confirmed FTD is down 35%, the next rise could wipe out profits.

For RevShare, the model is different

With RevShare, instead of a fixed payment, you need to look at income by cohorts. Here, the decision on scale is made more slowly: some of the value comes later. Hybrid sits in between these approaches.

For comparison, use the formulas calculators material CPA, RevShare or Hybrid.

Add a safety margin

If the CPA rate is conditional at $120, and the confirmed FTD is stable at $117, formally the campaign is a plus, but economically it has almost no protection. A small increase in the CPM or a drop in the approval rate will turn it into a negative. Therefore, the team must determine the target stock, and not work at the breakeven point itself.

Spread out the cost of the FTD

Cost per FTD can be understood as the result of several multipliers: CPM, CTR, click → registration and registration → FTD. If the price has deteriorated, find out which multiplier has changed. Then the decision will be specific: creative, landing, audience or bid in the auction.

Don’t Average Profitable and Losing GEO

One overall campaign may look “zero”, although KZ generates profits and the other segment systematically eats it up. Separating the budget for GEO helps not to close the work area along with the weak.

Scaling plan

Before increasing your budget, write down three thresholds: the desired cost per confirmed FTD, the allowable and the stop level. Then the decision is made according to a predetermined logic, not by emotion after one bad day.

Separately count variable and fixed costs

The advertising budget is scaled along with the volume, and part of the team’s spending remains fixed. The margin economy is important for the “flow on or stop” decision, and the full P&L is important for the valuation of a business for a month. Don't mix the two levels.

ROAS does not replace profits

Even high revenue to advertising costs may not cover additional commissions and operating costs. Use ROAS as a quick signal, but build your final decision on the cash result.

Worsening scenario

Before the scale, calculate what will happen when the cost increases by 10-20% and the approval rate decreases. If the model immediately becomes negative, the supply is insufficient. This is a simple stress test before the auction does it for you.