Why would someone get a stake from here if they could just go on the asset page and buy a token?
As well - AFAIK - there was no rule saying you couldn't sell your own account. There was one guy who tried before the AE and I think he got 3 or 4 BTC for it, but too long ago to remember.
It just doesn't seem particularly legit to try to sell an account, too much risk versus buying on the AE.