Tis' the season..
I just did exactly the same thing. I'm not switching out sponsors that i have floating now.. but i'm re focusing my effort and using 2 or 3 that have really broad based sites and that have allowed me to peep inside their sites so i can actually see what the surfers are getting.. we don't need content but need recurring conversions.
dropped one cam site because of their unethical policies.

and a few of the cam babes have their own paysites that are really stuffed with content and updated almost weekly.
better to get bigger checks than 50 small ones.. well let me re-phrase that.. All checks that are cashable are GOOD checks.