I didn't hit the AH until I completed Act 1 and before then I was simply relying on my magic find and the blacksmith to get good gear. I think I stopped upgrading the blacksmith around 8k and I just upgraded the jeweler once to see how that system worked. I'm currently lv 25 and almost finished with Act 2 and I can't figure out the point of those two money dumps. Are there amazing things down the training tree that I wouldn't be able to buy in the AH for a fraction of the price it took to get there?
I myself kinda got addicted to the AH once I figured out what sells, how to appropriately price my items, and how to flip stuff. I started off selling stuff for 2,000 to 3,000, but now I'm in the range of 5,000-8,000 on my items that sell in less than 10 minutes. I have yet to buy anything more expensive than 3,000 since there are always people who are simply trying to get rid of something amazingly good for Demon Hunters.
At this rate I can't see myself going back unless I want to get achievements for using the blacksmith and jeweler. Can someone set me straight and tell me if I'm doing this wrong.