I've bought and sold lots of things on eBay and have not had a bad experience. I always check the seller's feed back though and I wouldn't buy if I saw some questionable comments in there. I mainly buy craft items for cardmaking, but just recently managed to get a reprint of an old archaeological book on Egypt. Copies were selling for £120+ elsewhere and I managed to get a mint copy that someone was selling for £25. I was pretty pleased with that.

I've sold all sorts of things. It's very exciting to see the bids come in.