Hi there-
We do something sort of similar, but you maintain more control over your site...
RealBigCash works with sites and programs that already have their own billing/hosting by providing an affiliate arsenal to market the site(s) for you. We handle the affiliate payments (on a per-join basis), affiliate support, getting your banners/galleries/etc. uploaded to our servers for them, etc. ... you maintain total control over your site, rebills, members' area, etc.
If this sounds interesting, please look over our site for more details and feel free to contact me with any questions.
Cheers!
$hannon