1.) I get 50% but recently I did get a couple of sales at 100%. I'm no whale though so others may have other rates!
2.) Standard Check, Wire transfer, Payoneer, WebMoney, Ecoin, Paxum.
3.) From the conversations I've had I'd guess: Cash for Sex Tape, My Pickup Girls, Private Home Clips (or maybe Student Sex Parties).
I am not sure about downloadable picture content although I'd imagine if you contact support they'll help you. They certainly have picture FHGs though.
I do not work for them but in case you need a linkipoo:
Serious Partners 