I've got two bank alts, one on one account parked at the neutral AH in Booty Bay, and one parked in Stormwind on another account. As I grab loot I don't need, I vendor all gray trash, with the help of 'Auto sale' on Jamba, and send anything I don't need/want to my alt in Stormwind and toss on the AH there. The one I have in BB is setup to keep some 'Alliance-only' pets up on the AH to sale to the Horde. I'll delete this toon eventually when I need the room for another toon, but once in a while she'll draw in a good amount of money for me. Now so many people on my server do this, I don't get so much money from it. But my SW bank alt keeps alot on the AH and gets a good amount of money in return. Keep in mind, tossing armor gear and weapons on the AH will drain your bank quickly if you keep them up there and no one buys them. I Disenchant these now and sale the mats from them cause it costs less to no money to keep up. Linens for Tailoring/First Aid always sale too. So if you can some good spots to farm for those, try that for a while while you're leveling up. Even trash armor and weapons when vendored will bring in a nice income. Hell even the greens will too if you want to vendor those. I do sometimes when I need the extra cash. Try using Titan Panel or Accountant Classic to track your income each day or in each area you're farming so you'll know the best places to hit up.