The thing is, unlike eBay, the Auction House is instantaneous; once you part with your Crowns, the item you were bidding on magically appears in your inbox. So unless you're suggesting a delay between winning an auction and receiving your prize - which would drive the vast proportion of Auction House users absolutely nuts - I don't really see where a "cancel" option would come in.

It's not really Three Rings' problem if you splash a bunch of Crowns on something you didn't actually want. If you want to avoid spending loads of cash on stuff you don't want, I suggest not bidding on stuff you don't want. It's a system that's worked really well for me so far.

I agree, though, that you should be able to remove completed auctions from your history, both purchases and sales. It's unnecessary and untidy as it stands.