Do you think you would have sold it for as much, if at all, if you had listed on one of the other sites that have no buyers or if you had advertised it in the 'real' world which would only be free if you stuck to community boards and newspapers. I am sure you would probably have got a lot less for it than you paid in ebay fees.

Do you really think that somebody would have paid as much if they did not have the security of using Paypal, they would also have had to have that much cash to hand and could not have used a credit card so 2.4% plus a few cents seems like a small price to pay to me.

You knew, or should have, when you listed how much it would cost you, approximately 10.5%. How much less would you expect it to be. Ebay and Paypal are not charities!