i looked at the ah once in the beta since they asked us to look at it. unless you people remind me its there i will forget it since i have no use of it what so ever. I will find my own stuff nobody else that is how i play. makes good drops more fun.
As far as I'm concerned, there is no AH. I'm playing one character completely MP with my hubby. It is my farthest along, in Act 2 Hell. All others are SP only, my furthest is up against Diablo in Nightmare.
Wife and I bought each other the Collector's Edition for Christmas (per-ordered). My play time is limited... real life, work, wife, kids... and carpal tunnel syndrome. Playing an hour or two here and there.
Playing solo 80% of the time, with occasional MP forays with two of my friends from work. NO Auction House. Maybe I'll change my mind at some point, but right now the idea of buying my items feels... dirty. I know Blizz gave it to us, wants us to use it, whatever... but I need to do at least first character self-found before I cheese out to the AH.
Have a level 42 Wizard, a level 3 Witch Doctor, and my daughter made a Monk to play (think she's level 12 now). Currently getting my butt handed to me in Act 2 of NM, wearing gear I found in Normal.