Selling used PC hardware on ebay is a bit troublesome though. enless you got good feedback most will probably not buy it cos they'll expect the goods to be DOA (Dead On Arrival). So its vital that you really put alot of thought into the item description. make them buy in confidence. (also ensure the item(s) are very well packed. anti-static bags, bubblewrap. etc)
Ive spent quite a few hours talking with people who've brought my goods and basically screwed up trying to install it, then saying ive sent them faulty goods. i just try my best to help them out. usually i can solve thier problems quite quickly. othertimes its just thier own fault and they are responsible for the item being broke, in which case i make it clear that its hard luck and they will not be getting any refund.
Ive yet to recieve any negative feedback

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Personally i'd never buy used computer hardware. but thats just me. i like new shiney things to play with.