Im not sure its a case of higher pay equallying higher shave rates but, typically the more a sponsor pays out based on trials to payout, the more cross sells will be on the join page and the more upsells will be inside a members area until you get to things like live cams, where the surfer will actually join to see a specific model (or type of model) and continually rebill, which is where the cam programs can afford to pay higher rates.

Regards,

Lee