it's not really a pay for power system. Same as any AH, just you pay money instead of gold. Does not really change the dynamic of the how you get loot. And i don't see them making that much money from it. If you have the money go into your bn account instead of a 3rd party, i don't think they really charge you anything ( i do think they have a small listing fee still.) Historically, Blizz has been pretty against people selling mmo items for money, however, if they get a cut, maybe that is not the case. I don't really foresee them migrating this into an mmo, but more trying to make an easier way of trading good in Diablo, as selling and buying loot happened a lot in diablo anyway. Saying that, i do think it's a stupid idea.