Ever had that time when you bid something in the auction even though you never actually needed. And instead of some guy outbidding you, you end up winning the auction and your money getting wasted?
For me, there should be an option in the Auction House where you can cancel out your bid so that you can get your money back from that auction. But how will it work? When you cancel your bid, your money will be refunded, and the previous bidder will get his money taken from him and be the highest bidder. The item's price would also be the previous bid from the previous bidder. Come on, OOO, you should implement this so that bidders who want their money back can cancel their bids, and the previous bidder who likes the item but have ran out of money from bidding but looses in bidding should get another chance in getting the item the item.
By placing the bid in the first place, you already agreed to pay if in the event you win. There's no real feasible way to mis-click it without going out of your way to do so, given how there's a lovely little delay in between clicking an item, and clicking buy now or bid.
If you really didn't want it, why bid in the first place? Be more responsible and don't be so hasty, silly.