A better idea so as not to run afoul of the TOS would be an "I'm Saving All My Endorsement Cash For You!" where you promise to endorse and bid $965.34 on the listing of whoever makes the largest deposit to your PayPal account in the next 30 days.
Prosper has a precedent of tolerating
contests where the winner receives a large bid from a lender; the issue was never even raised that anyone was doing anything in exchange for my bid.
This contest would inspire ID thieves to send you a $500 or so in the hope that you'd bid $965.34, other lenders would jump in, and they'd hit a $25K jackpot. And you'd collect a few $50 and $75 entries along the way.
One you understand your target audience--the desperate and the criminals, you can adjust the prize accordingly. There's no need for a draconian 50% markup--the scammers who would be sending you the cash are ID thieves who have the credit record of a good, solid AA, A, or B guy and they just want to get the thing funded for $20-$25K--they don't care if you are actually in on the final loan or not.
More importantly, you don't need to bid at 1%--a bid at 35% is fine, and probably even preferred by the scammer who wins.
True, he doesn't care if he's ripping you off for $965 or a combination of other lenders for $965, but if you're left with your prizemoney you can run another contest. He might run the same scam next month and win and get another $25K Id-Theft listing funded.