Are you looking for per signup or recurring? Since most people on your sites were used to exclusive content and most of the big boys license the same feeds, I'm guessing you would prefer per signup since retentions won't be that long.
I have been promoting adultflics.com from traffic cash for about a year non-stop and I've been getting 1:50 conversions on premium search engine traffic. Pays $40/signup and it's my top converter among all sponsors and sites.
http://www.tcg2.com/?wm_refer=w2kseo
WG