coins are going for $20-30 on ebay.
Of course I can't say how many people are buying them using stolen ebay/paypal information which is very likely unfortunately.
coins are more expensive on Ebay because there is a "risk premium". If you sell on Mt. Gox, you can be sure you are not cheated by the buyer (ie. no chargebacks.) You do not have that protection on Ebay, so sellers demand a higher price for their increased risk.