Give us some viable solutions instead of quoting the same thing over and over.
I told you already. Ban account selling. You banned kiddy porn right? Treat account selling like kiddie porn, knowing full well some of your users are going to trade it anyway.
Don't give me that crap it won't be effective. It will make it harder for people to buy and sell accounts if they can't use this forum as an advertisement platform to do so.
EDIT: Personal attacks do nothing for your credibility.
As you are defending abusers of the trust system, you are the last person who should be talking about credibility.