PokerChamps claims they will pay out on tournament buy ins as well.
“Yes – buy-ins of a tournament will contribute to the bonus/affiliate program as well as real money games.”
They’re still in beta, but I love their software and hope their program doesn’t suck in the long run. I’m building a site around ’em after all…
Their tech support has kicked ass during the beta. If they pay that sort of attention to detail going forward, I think they’ll be pretty damn slick. 
Cheers!