I've always done OK from ebay, buying and selling. I favour selling a bike on there on a classified ad, simply because it probably has the largest audience. My logic is that if I'm looking for a bike, it's probably the 1st place I look, then Autotrader, MCN etc. There is some junk on there and some overpriced stuff, but it's just a case of working through it and doing you homework. You'll find most dealers are on there now too. When selling, you'll get the odd chancer offering insultingly low money, but that comes with the anonimity of being behind a PC monitor I'm afraid. Of my last 5 bikes, I saw 3 of them advertised on eBay.