i don't have 4 alts to lvl or w/e but i have made TONS(3000g) of money by just selling EVERYTHING. it's a waste of money equipping your alt with stuff that's just gonna be upgraded the next instance. i'm currently only lvl 35 on my mage, i run sm with a 70 pally and i loot everything(yes even grays) and sell it all. vendor grays/BOPs and auction ALL the greens...

i also use auctioneer mod to help me sell stuff. btw - get the "classic" version and not the new one... it's a LOT easier to use and when you go to the "post auctions" tab and put an item up, it will automatically choose the best price to auction the item at

use the "scan" feature on the main tab to update your database with prices of everything(once a day for about a week should do it, and even then update everyday or at least every day that you log on)