Worst time I had on Ebay was when I sold off my Toshiba HiFi.
At the time I truly thought that sellign on Ebay was a contract that I was not able to back down from, and I saw the same HiFi going twice, one was for £390 and the other was £460 and so I said to the wife that Id put mine on...
Mine was teh sme but mine also had a DVD Player, plus the Amp was the next steup up and it had optical inputs as well, so mine was clearly worth more.
It went for £40 and I have it down with £30 postage.
So, I got only £70 for it.
Worse was that it cost me £45 to post it because it was so heavy
Even more insulting is that the guy who bought it off me put it on there I think the day he had it, with a BIN of £600 and he sold it that day.
I was told that I could refuse to sell it but only after this.
Since then I have been very careful to word my sales.