I sold a few GPUs recently on eBay and fucking PayPal held my money after confirmed delivery (and positive feedback) for 10+ days because they said "there was a lot of fradulent activity" in the graphics card market, so I had to just wait for them to "release" my money in my account. After a chat with eBay support - the funds were released.
Never sell this sort of equipment on ebay. They always side in the buyers favor. Those who are buying can play and say they did not receive the item and usually ebay&paypal will hold the money until they investigate has concluded and most of the time they believe the buyer who can just say they didn't receive anything. Then they have your graphics cards and their money back after just waiting 10+ days.
That is a messed up system they have their with ebay acting as "escrow".
Might as well put them up on the marketplace board here and let the devoted miners here pick what they need so to keep the mining community alive.
Here is the computer hardware/mining equipment thread:
https://bitcointalk.org/index.php?board=75.0