And it's not like people weren't selling, trading, and buying gold in D1 & D2. Blizz got smart and made it a part of their system instead of allowing all these 3rd parties. Although those still exist it is however much safer for a user to purchase off the AH.
i7 930 @ 4.2Ghz
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OCZ Vertex 2 100GB SSD & VelociRaptor 300GB