My colleagues and I have had issues with ebay in the past. And being that sites like ebay and amazon survive off fees mostly it will be interesting to see how they adapt or fall off as bitcoin becomes more mainstream and then more preferred as a payment option. Though this is probably another five years away or more. I am really  hoping both ebay and amazon choose not to accept bitcoin for a long while; which will  hopefully allow other smaller start-ups a decent share in the market.