But I like her other question better: what's the dumbest thing you've ever spent a bunch of ingame gold on? My waste of money is probably more of a mistake than an actual embarrassment -- I remember spending a good 100g to outfit my level 40 Mage in the shiniest stuff I could find on the AH, including a couple of world drops and the whole shabang. I had in mind that I was going to take her all the way to 70 -- and then I think I never played her again. What a waste.
I'm sure you all have better stories, though -- ever accidentally dropped a lot of cash on something you couldn't actually use, or splurge on an item that was a little silly, just so you could have it? What's the most money you've ever wasted on anything in the game, and what did you buy?