I have no problem with a player controlled auction house, but there is one catch. I hope Bungie (AH or Not) doesn't artificially shrink the drop rate of the high end items. If the game truly isn't an MMO then it shouldn't take you a month of Sundays to acquire the items you seek through raiding. If legendary/epic items don't have a tremendously slow drop rate then AH being player controlled wont matter since it would be only slightly less convenient to go grab your own. This form of AH/economy could actually be beneficial for alternate characters because you can just buy equipment great for your level and move on.