Flat pricing vs percentage of spend, the math

A lot of marketing software prices itself as a percentage of your ad spend. The pitch sounds fair: pay for what you use, start small. And at small spend it is genuinely cheap. The math turns on you later, at exactly the moment things start working.

Run the numbers

Take a typical 5 percent of monthly ad spend, a common shape for this pricing (some tools charge less, some more, and the exact number does not change the story). The math below is illustrative. It quotes no specific tool:

• At $5,000 a month in spend, the tool costs $250 a month. Reasonable.
• At $20,000 a month, the same tool costs $1,000 a month. It did not do four times the work.
• At $100,000 a month, it costs $5,000 a month. That is a full-time salary, for software whose costs barely moved.

Notice what the percentage actually taxes: your growth. The bill climbs precisely when your ads start working, which means your best months quietly carry your worst line item. Scaling spend from $20k to $100k is hard work. A percentage price means the software takes a cut of every step.

Why vendors like it anyway

Nobody is running a scam here. Vendors tell the alignment story honestly: we grow when you grow. And in one narrow case it can serve you: if your spend is tiny and may stay tiny, a percentage can be cheaper than any flat plan. If that is you, take the percentage deal without shame.

But alignment cuts the other way too. A vendor paid on spend has no reason to help you spend less. Every efficiency you find, every wasted dollar you cut, shrinks their invoice. The incentive leans toward more spend, and you want a tool whose incentive leans toward better spend.

What we chose instead

Spuro charges one flat monthly price per module. The Ads module costs the same at $5k a month of spend as it does at $500k. When your scaling month lands, the software bill is the one line that did not move.

The trade is transparent: at very small spend, flat can cost more than a percentage. We accept losing that segment to keep the incentive clean. We want customers who plan to grow, on a bill that never punishes them for doing it.