The most important tip

The best way to lower prices would be to act like you do not care. Many times I have said no to offers, and got desperate whispers 2 minutes later with a half price offer land of chaos Gold. Impatient sellers will sell at a low price.

This is probably the most important tip. Auctioneer scans all the items in the auction house, allowing you to know the market price of items, find bargains and sell them for twice the price and what not. I could write a book on this one, but we need to keep it short and to the point. Get Auctioneer here.