I pay both 20% for my live feeds and 50% for my paysites...
the difference is on the feeds I have to pay the chicks 40-50% and the processing and overhead you figure it out there is not enough room to go any higher for me than 20% on live. But our averrage user spends $700 thats $140 comission but then again ya have to wait a year to get it out of them. And webmasters want it all and they want it up front

Paysites I can pay 50% i could pay more cuzz there really is very little overhead in paysites. Content and updating and whatnot not a lot of work. Marketing is the biggest cost !