Yeah this is assuming that he isnt dumb enough to list it for sale here on the forum, but lets take it for a fact that once this guy has decided that he is leaving the forum, any post from his account could potentially be from someone else who bought his account.
What if he came back? Ask for a Bitcoin/PGP signed message? I don't think so! It can also be faked if redsn0w really wish to sell it and help the buyer at all means.
~~MZ~~
With the so called 'Near bullet he dodged' by mishandling an escrow, his trustworthiness in this forum was already lingering on the edge of a blade, so if he makes an abrupt announcement of leaving the forum and then decides to come back again, then people will almost never take him seriously.
This forum is full of trolls who are wannabe vigilantes and they would have a field day on redsnow's trust score.