The better gear you have the harder the chance you have in rolling a good upgrade. Its only a matter of time before everyone starts with the AH again.
Also on the AH you could actually search for the stats you want. With crafting you might get an amulet that improves your DPS and VIT but you might be losing on AR. Now you need to upgrade something elso to make up the AR.
Everyone soon will realize that sitting there throwing good coin away on a gamble crafting for an upgarde is time wasted only because its hard to get an upgrade fo the stats that you actually want.