I was a seller of laptops a while back and I always seem to come across people that would email me and try to buy them off my hands if I would cancel the ebay auction, and usually the prices they would offer would be outrageously high. More than anyone would pay on ebay. So I did accept one of the offers and they sent me a fake confirmation of a moneyorder. Good thing it was easy to spot it was fake because it had so many misspellings and the guy spoke very bad english.
So inconclusion be careful with people that send you emails claiming they wanna buy something from you and will send payment right away. Cause they are usually frauds.