I've always done it. Sell the current unit before AppleCare runs out and you get a good price for your tower/whatever. But when I sell my iPhones...it's nuts. I paid $300.00 for my 3Gs and $40? for AppleCare last May off of Ebay. I got an iP4 for anniversary/birthday gift so I am selling the 3Gs.
You should only accept payment from a bank account, that way once the money is taken out the buyer can't take the payment back.
Make sure you get a signature for proof of delivery if you accept credit cards. That still is not protection from chargebacks though. The buyer can initiate a chargeback weeks after you get your money, saying they never got the item, and PayPal will take the money back from your funding source(s) until the matter is cleared up, and it's up to you to prove that you shipped the item and that they received it.
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