Honest revenue sharing network

Maybe I'm naive, but why do site owners give 50% of contextual advertising revenue to their long and hard-to-grow projects to Yandex, Google and Runner advertising networks? I could be called obscene if I argued between 3 and 4 percent of the ad network payouts. But 50% ... this is robbery.

The idea: to create a contextual network with the percentage of payments in the proportion of 95% to the partner / 5% to the owner of the advertising network.
For advertisers - advertising will be cheaper - we don’t pay 50% to Yandex and it’s not clear why.
The partners' incomes will not fall at least, and will increase with time - the cost per click will be pulled up.
Ad network - 5% of the contextual advertising market, this is hoo.

For such a project you need a very good start, with big money. And most of the money in marketing - technically, I in this project do not see anything frightening. We need to collect a critical mass of advertisers on the one hand and advertising partners on the other, who will believe and start working.

I am sure that very quickly people will understand that the context on the pages of your sites should not be given 50%, and a startup can firmly sit down on 5% of the context money, having moved in this niche of Runner, Yandex and Google.
')
Criticize. How deep is Boyan?