I've sold all my miners (about 20 BTC & 8 altcoin ASICs) on ebay & the only issue I've had is folks not communicating after the auction ends & not sending payment.
Then I open a non paying bidder/cancelation of auction case to get the fee's removed.I ask that no feedback be left & I leave no feedback for them.
http://pages.ebay.com/help/sell/cancel-transaction-process.html
http://resolutioncenter.ebay.com/
Just check this box: The buyer and I agree to cancel a transaction.State in the comment box,No communication,No payment received.
After 7 business days you close the case & your fees are removed
