AppleCare and selling your old Mac on eBay
Some of us know how valuable AppleCare is. Many people don't.
Buyers on eBay (or wherever) generally don't value AppleCare anywhere near what it's worth, if they value it at all.
If you advertise and sell your Mac as covered by AppleCare, you are throwing money away.
However, in case anything goes wrong with the Mac after you sell it, you don't want any bad karma. So, you want the buyer to have access to AppleCare, but not on your nickel. If they don't want to pay for AppleCare, they're on their own.
As a seller here is how to get full value for the AppleCare you purchased. For this to work, you had better buy your AppleCare contract directly from Apple!
If you're selling within 1 year of original purchase:
1. Advertise that the Mac is eligible for AppleCare.
2. After it sells, instruct Apple to remove AppleCare from the Mac, and get the refund of the pro-rated remaining value of the contract.
3. The new owner can buy AppleCare within 1 year from the original purchase date.
If you're selling after 1 year from original purchase:
1. Advertise that the Mac comes with a 30 day option to take over the AppleCare contract for the remaining pro-rated value of the contract.
2. If the buyer opts to take over the AppleCare agreement within the 30 days,
a. they PayPal you the money, and all is good. You or they contact Apple and inform them of the new owner.
b. you instruct Apple to remove AppleCare from the Mac and get the refund of the pro-rated remaining value of the contract.
I have double-checked the facts with Apple support. I hope the facts don't change.
MacBook Pro, Mac OS X (10.6.7)