I have always found
eBay a bit hit and miss I have just sold a couple of things, I think the fees put people off a bit, there are other ways to sell stuff on line (especially bicycle related) that avoids the fees but eBay has a larger user base.
There was a bloke wanting £200 + postage or offers for a used Sturmy Archer S2C wheel with open pro rim, the rim had a long scratch on it I offered him £75 including delivery, he made a counter offer of £100 plus delivery.
I pointed out to him I could build a new one for that (not with an open pro rim) so declined his offer, he didn't sell it.
You have to be realistic when selling, if he was willing to accept £100 why put it on for £200.