The message is consistently the same - do your homework, communicate fully, promptly and effectively BEFORE anything changes hands. Get comfortable that you know who you're dealing with. I have had a couple dozen very satisfying (and cost effective!) transactions involving audio gear, and the only time I got burned was when I was impatient and dealt with somebody who wasn't good at communicating. It should have been a clear sign, but I ignored it. Clearly, from the posts above, just asking a few questions was enough to get the scammer to decide to not burn the questioner.
I think it's great that there are people who, having identified this, have spent the time it takes to notify the sites and the potential buyers - you've done a great deed! -Kirk