Yes, scamming with paypal is a real issue. But the solution is easy: use moneybookers because there is no dispute or charge back possible.
If you want it simple, sell at
www.account-bay.com or any other auction site that you can find with moneybookers support. Then you can make your own prices (maximum profit) and are safe (moneybookers) and compared to ebay it's also cheaper. account-bay.com only charges a final price fee of 5% while ebay takes 9% final price fee and listing fees.
The best way though is of course selling to people you really know in real life and you can trust.