Don't forget the "Move" keybind and holding down shift to attack indefinitely, and moving without clicking constantly!
I play 2 toons often (im in no rush to burn myself out on 1 class) I sell blues (unless something really awesome drops for the other character) and with that money level up the BS/JC. with the mats I make with the other character I am able to play Loot roulette with the BS and sell things on the AH if they appear good for other classes or just turn them to mats again.
Right now im on 300k gold and my BS/JC are able to craft things higher than my current toons level.
Honestly, I have too much of that damn dust already. I'd rather just right click sell blues than waste space on mats I don't need any more of.
not equipping the best weapons (and not using AH to find more good weapons)