They would be more concerned about the hacks regarding the paid auction houses because Blizzard could be held liable for criminal or illegal transactions.
I'd assume the idea from Blizzard was instead of having a ton of gold miners and illegal sellers, they figured it would have been more easier to monitor and regulate them in an a single official spot.
There is still regular auction houses that only swap items and the traditional way of getting items for those who don't want to spend real money or play in a more leveled playing field. I wouldn't be surprised if they eventually have a server just for paid auction users to separate them from everyone else.
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