If you are scammed on ebay, and you have the sellers actual name and address, file a mail fraud complaint. The post office investigates every one of them and they get action!
If you are scammed on ebay, and you have the sellers actual name and address, file a mail fraud complaint. True enough, but I prefer to avoid complications. For me, it's faster and easier to take the hit rather than waste more of my precious time on earth trying to track down $20.
I try to make sure that a) the people I deal with are somewhat reputable, based on their feedback, and b) that the transaction doesn't involve anything of great value (the most I've ever bought was a $100, and sold was $300).
I have bought a lot of items on Ebay but I do see a lot of fraud. If the Confederacy had owned that much equipment they would have won the Civil War.