The Diablo 3 auction house is definitely a fun place to be when you are tired to play the game. Even though it looks more complicated compared to the one from World of Warcraft, once you learn it, you will agree how good it is regarding its structure.
There are many filters that will help you find the items you need.
If you are a barbarian for example and you look for a 1 handed weapon, select equipment, (preferred stats which is optional, you can choose vitality and strength), hit the search button and all the weapons will be listed, the ones with the highest DPS being in front.
There is no way to change this order like to choose the price for the items.
Why to use the Diablo 3 auction house?
First of all, even if you farm a lot, there is a good chance that you won’t get very good items and starting from Hell mode, auction house is required as you can’t progress in the game without having the best or very good stats. If you play on public games, you will decrease your team’s performance if you have bad gear.
After 3-4 hours of a playing session you can earn around 30-40.000 gold just from downing mobs and bosses so you can afford to spend them on auction house items.
Real money auction house was delayed again by Blizzard, there is a blue post on the official website, what is interesting to follow is that smart players are keeping their very valuable items to sell them through real money auction house instead of selling them right now just for gold.