Regarding the cookie issue, my answer will be post here
http://www.gofuckyourself.com/showth...ighlight=gamma
Gamma Cash pay $25 per sign-up and charge the surfer $30.
Gamma Xtreme pay $35 per sign-up and charge the surfer $40.
If you want any help on promoting site that convert with Gamma, you can always contact eric at gammae.com.