"If it's too good to be true......"
There was a post on another forum about a fellow who thought he had gotten the deal of the century, the Canon 200/1.8L for $1600. Not only was it a bogus deal, he fell for the line about getting a better deal by emailing the seller direct (outside of eBay), and was directed to do a Western Union transfer to a fraudulent escrow company (that was even listed on eBay's fraud altert companies)