Not really. Steam has virtual wallet, which is literally locked to their platform. You can't chargeback on the vWallet. You can only purchase stuff from the steam platform. Thus, once you sink your 60$, you enter a closed loop. If someone sells YOUR games, it is not impossible to track all transactions and revert them back and track all the money back and ban the offenders. Also I don't see how any of this would affect their Steam sales? Even now you can only own a single copy of a game and every other copy is stored as a gift on the platform that you send to your friends. If anything this could bump up Steam's numbers since more copies would be sold at a sale. This will effectively kill G2A and the likes... And I don't know what you mean about WoW account selling. WoW is not advertised as goods but rather as a subscription, which is what Steam's lawyers tried to make out steam to be but the judges seem to be smarter than that and figured out that steam does, infact, sells goods and not services. Which brings other implications. When you buy goods in the EU, the maker cannot take them back. So I don't know how legal bans are after that :D