If CPS's loans were profitable they wouldn't be dumping them on unsuspecting Prosper lenders.
On the terms CPS is getting, heck yes they would.
It seems like they're selling loans issued at 19% for 15%... meaning the Prosper lender assumes 100% of the risk, CPS keeps the lien on the vehicle, and CPS makes 4% off of Other People's Money.
Even if CPS knew the loan to be "close to a sure thing", they should just take the Prosper lender's money, originate another "close to a sure thing", and then keep the extra 4% made from the first loan. If one goes south, well, sucks to be the guy who is actually risking capital.
Prosper is going to be an amazing deal for CPS -- for the Prosper lenders, not so much. Not only that, but apparently CPS has discretion whether or not to repo the vehicle. Well, a repo is a pain -- there is a bunch of paperwork involved, after the repo you have to store the vehicle for at least 15 days to give the "owner" a chance to redeem it by bringing the loan current, etc. Since it won't be CPS's money at stake, why would they bother?
in the past, they've repoed them just to put back on the lot, or sell at auction at a slight discount and make a little bit of extra money. and the original amount + interest accrued + late fees is still owed on a car the person no longer owns. usually that's not "collectable", but whatever. sometimes they might get lucky.
it remains to be seen if they'll try to repo these or not. as the lienholder, I say they just might. from what I can tell so far, they'd only owe the Prosper noteholders what was collected (but not do the actual servicing nor collecting), and not the proceeds from collateral. so they can still have their little auction side business going for a quick sale ("gravy") on top of what they've already gotten for the pretty worthless notes from Prosper "investors"