I don't think this account has been bought or sold, this person told me that he's just rarely online and active on bitcointalk. He didn't even know that people can't get avatars anymore.
Maybe not yet, but looks like he's trying to sell it now:
https://bitcointalk.org/index.php?topic=848734.new#new 5btc lol.
5 btc lol, I won't trade with this user from now on, since it seems like he's trying to sell it. Thanks for the advice!