What I don't get is why aren't the admins trying to put a stop to account selling? Every day I see a bunch of people selling accounts, most of which are probably hacked.
Admins can't do anything in this regard. If theymos doesn't prohibit account sales by default, then the admins and mods just go with whatever the rules are. And as per the rules, you are free to buy and sell accounts.
It's basically a rule from the perspective that if people aren't allowed to buy and sell accounts here, they will move elsewhere with their "business", and thus there is no incentive to prohibit on-forum sales.
That being said, that however doesn't mean that nothing happens in terms of the community taking action. There are certain members tagging proven bought accounts with negative trust, so that's at least something.