At the same time, how can you trust the OP that he will not misuse the fact that he knows "someone's" personal information, or account? He can always report to Stake that someone has stolen his account and request a recovery with new access info.
I don't understand the business but I see there is a market for it and it is not small. I was once in a website where the whole site was filled with buying selling accounts, account verifications, paypal balance sell and many other things that are normally not appreciable by the gentle society but those internet users were making money from it. From their feedback system it looked to me that the trades are legit too.