So I think I may have accidentally pissed away over 200k gold due to the way the AH works. Bid on an item. Decided I wanted to raise my bid, but didn't have enough to cover the cost of the entire new bid (just in addition to the gold from my current bid). So I put the bid in, and it gives me an error saying I don't have enough to cover (since it takes all the gold immediately from you when setting a max bid.) It didn't refund either the original bid, or the second higher one though. So either it worked, or I'm out 200k.
Item I was after is something that could easily go for millions, and certainly at least a million. So it may work out if I get outbid by someone eventually, as it had more than a day left I think.