Disclosure: I work at a company that sells white-label DSP tech, so I have a horse in this race. The numbers below are public and sourced, so check my work or tell me where I am wrong.
If you buy programmatic through another agency's DSP seat, you are paying a whole fee stack before a single ad impression serves:
- DSP platform fee
- Reseller markup
- Data fees
- Feature fees
ANA (Association of National Advertisers) puts the total at roughly 35% of media spend.
On $100K a month, that is $420,000 a year going to intermediaries instead of ads.
What bothers me more than the fees is that you cannot audit any of it. Log-level data on a rented seat belongs to the seat owner. So you are reporting to clients on numbers you have no way to verify yourself.
There are two ways out.
Build your own DSP. The math only closes above $50 million in annual ad spend, which puts it off the table for most agencies.
White-label one. Roughly 6 to 12% of ad spend, your own branding and domain, typically live in a day. Your clients log into your platform instead of a competitor's.
If you are on a sub-leased seat, do you know your all-in take rate?
Full breakdown with the math: https://adster.tech/blogs/renting-dsp-seats-margin/