Don't the scammers often use the victimized sellers as drop shippers?

Say, Alice lists a laptop on eBay or Craigslist. The scammer has also listed a similar model for sale, and Bob has purchased it in what he believes to be a legitimate transaction.

Scammer "buys" it from Alice, with either fraudulent funds from a stolen card (that would get charged back eventually) or just delivering a forged paypal mail. Or the famous "P-p-p-p-p-owerbook"[1] scam involved a fake escrow service. The scammer has Alice ship the laptop to Bob.

Alice is out a laptop, Bob gets a laptop, scammer gets Bob's money.

[1] http://forums.somethingawful.com/showthread.php?threadid=101...