I sold an old Rolls Royce on there for $50K. It was owned by Judy Garland, and got two celeb car collectors into a bidding war over it. The guy who won wired cash next day, car sight unseen.
Pretty amazing. Here's the pic of it.
I sell all my old computer gear on there also and it goes like lightning if you price things fairly.
I have a friend who started his coin business buying and selling on e-bay and he's now a millionaire from it. He also made a killing selling beanie babies when that was hot.