I have both bought and sold cars and bikes on ebay, never had a bad bike bought or sold on ebay, but cars a complete ******* both to buy or sell, there seems to be loads of pricks out there that stuff you up.
I have some rules set up on my account so it weeds out the messers out there, but you only learn through time.
Also recently noticed theres alot of people on there that seem to think its their own play thing and if they dont get the price they wanted, they wont sell you the item, or charge incredulous mark ups on postage.
ebay have made alot of changes ove the past year or so, and there not all in everyones favour.
My missus recently got charged £9 by a seller to send something that cost the seller £1.24 to post, so she asked for a refund against the difference, the seller told her no, so she left her neutral fedback, then got a threatening email fomr the seller telling her "she's a ****" and "its people like her that **** it up for everyone else" . when she gets back home next week, i want her to contact ebay to sort this out, as to me this is outrageous behaviour from the seller, and i know it has really upset her.