Amazon Prime and free 2 day shipping has ruined me for anything Ebay. The only time I turn to it now is if I can't get something on Amazon.
I sold a book on Ebay once, for $2500, and the buyer tried to scam me and say he never got it. The key with that argument is the signature from UPS. Without it, you can claim you never got something and Ebay (Paypal) will instantly refund your money if there is no signature to prove delivery. The only reason I got my money back (60 days later) was because the buyer changed his story twice in emails and when I demanded mediation and turned over the emails, they found in my favor. Of course, Paypal took their fees BOTH times, once when I was paid the first time, and then again when I was reimbursed after winning the mediation, but I still won the fight against a crappy buyer.
I still sell used computers on Ebay, and while the fees are a killer, I don't really care because any money brought back from these retired computers is found money. I would hate to rely on Ebay for my income though.