I don't know if this has been posted before, but I'm gonna repost it now in case it hasn't been.
The AH scam is simple, not only does it mess up Auctioneer, but it may get a dumb person to give you a decent amount of gold. Get a few mats, for example: Linen Cloth. Put a few stacks of linen cloth for a decent price on the AH. After that, put a few more stacks with a pathetic buyout, but a good starting bid. If all works well, somebody not paying attention close enough may buyout your stack of overpriced linen cloth.
I swear, this has worked for me only twice, but it was well worth what I earned. (It may take a while for someone dumb enough to come along)
This CANNOT get you banned or suspended. If for some reason you did, all you would need to say is "I didn't want anyone to buyout, I wanted people to bid so I set the buyout really high".
Sorry in advance if this has been posted numerous times :X