Using something like the AH just takes all the fun out of the game
IMHO,especially with a game like Diablo 3 which is about the loot you can get. Part of the fun of the recent Fallout games and Borderlands,was getting that rare weapon.
People make an excuse,that the blacksmith and drops are not enough,so they use the AH instead. You are basically just waiting for other people to do your work for you,especially since you can pay money for items if you
CBA to accumulate enough resources,ie,pay to win.
The worst thing is because loads of people will be using it,in the end you will probably have to so eventually if more content is released.