lol takes time, and you have to scan the ah often. I scan it each morning before i got to work and then place my bids. I caught the ah yesterday 10min before it went down for extended maintenance. lol so I won most of my bids. If you a enchanter use bottomfeeder it scans all the low priced items and tells you what you can make if you de it and repost.
I have used Auctioneer for about 2 months now, not even. And have twinked my alt, bought his normal and epic mount. I have weapons and armor for him in my bank. Got nearly enough for his fm, and by the time he is 70 should have enought for his efm.
20min a day ppl well worth it. As long as you dont buy kuk, just keep on buying bargains & mostly trade stuff and reciepes. I find that buying stacks and splitting the also works well.