i agree that banning it is totally futile. USD is part of the game now whilst it is so popular and all prices are inflated to ridiculous amounts.
However what i said when this site first started was that market posts should be limited to users only with a certain post count. It should be a priviledge to sell items, and buyers deserve to know who they are buying from. If you limit it to users above 100 posts, then usually those users have some information available about them and their past. Ive seen 1 post anonymous people selling hacked/scammed items on here which is totally disgusting.