Ive got a bear that I soloed all of ZG with, beginning to end. no raiding gear, just fully triumph-badge geared. If you are a skinner, there is some real gold to be made there. you get some specialized leather that is worthless, but you get a crap-ton of rugged leather which always sells well. The coins and bijou tokens stack in inventory and sell decent on ah. Vendor blues and DE the greens. just make sure that you fight the last boss, hakkar, alone, and after you've cleared the rest of the instance and he's easy, but slow, to kill. 2 chances for mounts, a pet. Loads of runecloth as well. I do it for fun change of pace when im bored with other things, not really for gold. but I noticed I came out a lot wealthier after it was all said and done even with wipes learning some of the tricks with bosses. Trash is easy, but beware pulling multiple packs of axe-throwers. They each can aoe+stun and if you get too many, they will chain-stun you while you impotently scream at your screen. (main place to watch for this is right outside the tiger boss where there are several packs in a row.)
Going to experiment with ZA next, i think. Then maybe with AQ20/40, MC, etc.