I was able to get an authenticator from Blizzrd years before my bank made it possible to do the same. They care about security if only because they lose a lot

I was able to get an authenticator from Blizzrd years before my bank made it possible to do the same. They care about security if only because they lose a lot of money spending time to fix up hacked accounts, and this will be even worse now they have a real-money auction house. In WoW they can just rollback items and if they duplicate some that were sold off by attackers it's no big deal. If they start duplicating real money then they need to pay out on it.