Banning account trades in the forum might finish the deals happening in public, like in Auctions or Digital Goods sections, but they will start doing it in private like how they trade Merits right now, in Telegram groups or other places where the buyer contacts the seller and fix the deal and then picks up the supply from the forum.
Whilst this is certainly true, it doesn't mean they have to be allowed here. People can sell drugs elsewhere or post their ref links in telegram but admins here are not responsible for what happens off site. Personally I don't think allowing account sales here looks good at all. It seems the users of this board don't agree with it either because I see lots of people marked as scammers because they tried to buy or sell an account.