It's all just a farce to prop up the soaring default rate.
No lender cares if the amount is 6 cents or 9 cents on the dollar, it is a loss that can't be written off, so Prosper is denying lenders both their money and their losses by holding the debt.
No one wants to buy this crap; the loans are totally worthless and for the most part noncollectable, it is junk paper with no backing, as is any PMI promissory note.
PMI, take 1 penny on the dollar and let lenders write off their losses.