Make some test buys with your friends' credit cards and see if you get paid. Buy prepaid cards for your friends (ideally in different card companies and different locations) and load them with sufficient funds.
Spend the $160 -$200 yourself to find out and prove they are shaving -- have the friend test your links like a customer would use -- make sure all is good browser wise, etc, don't use tor or VPNs use real IPs -- don't tell the sponsors anything -- see if you get paid --- then out or bless them them here. At least you will know which of your sponsors is honest.
Libeling the unknown evil is a GFY tradition
