The reason you're quitting is actually a big reason I'm playing again. I never liked the auction house. I didn't like the idea that you could just buy whatever you wanted. It felt like it defeated the purpose of a loot based game like Diablo. I didn't personally use it much but when you play with other people and they are saying things like, "Dude, you suck, I have 500k DPS because I bought this sweet stuff off the auction house" and they are easily doing five times as much damage as you is a bummer. It felt like a bad Free2Play game that was Pay2Win.