I agree with people saying the current system for auctioning hats is pretty bad and/or unfair. I've tried selling something in every auction so far and I manage to click through every dialogue box as quickly as possible yet 9 other people manage to make it in after I've already hit the last confirmation.
I think a queue system would work much better. One hat per player. Unique hats only, so if one person adds a black halloween hood to the queue no one else can add the same hood until it has sold and left the queue. Last but not least I think that some of the more common hats should be blacklisted. Examples are hats currently being sold, hats obtained from recent events/holidays such as easter/halloween and then hats which almost every player has like that one 50 gralat hat from swamp town which somehow got auctioned and sold for over 10,000.