It takes 30 seconds to make a trip to town and sell or salvage rares. For what? 30k?
Do you know how many mobs I can kill at MP7 that will drop 2 and 3k stacks of gold in 30 seconds?
It's simply not efficient to pick everything up and, forget IDing it all, just selling or salvaging.
I'm agree with you, but the problem is way more deep, at the end of the game you will realized that you are looking for GOLD you are not looking for items you want in the game, the items you want are all listed in the AH and that's not what an ARPG should be, since an ARPG is based on item hunting in a social constructive matter and currently the AH is taking all of that down and sending it to the trash.
It is my opinion, but I might be wrong, I'm not perfect.