Just to reenforce what Jackal1 is saying I'll tell about my one bad personal experience from a deal online but it involves a different, but just as scummy!, conman.
Several people, including myself, were ripped off by a conman back when I was playing AW in 1997-98. I was naive and I trusted this guy Ken Strohm (aka KenJR) who at the time was a community leader and real all around well-liked guy. He'd just formed a PC building business partnership with the lead trainer for AW and was to be the supplier of PC's for the AW 1998 convention. IMO, if people close to Kesmai and the AW Convention group themselves were doing business with him then I figured why not me? When he would post systems on the nntp newsgroup to inquires by people as to where to buy a 'puter he would post systems that sounded great. He promised "great" deals for his AW buds too. It sounded perfect!
I did some checking by emailing with several people about him and recieved nothing alerting back so I felt safe and bought a PC from him.
To make a long story short the PC I got was was NOT what was ordered and was clearly inferior. I eventually found out he didn't build itt but had the local PC sweat shop in town (Florida) make it. I called and emailed him to discuss the problems but he would not answer my emails and his phone (turned out to be a cellphone) stopped working. So after a few weeks went by I called his business partner, a handicapped veteran, and after talking with him (he had no invoice of a PC ever sold to me even though I had one with thier letter head on it) I found out where my PC originated from. And that sadly he could not honor any warranty on it but would help me any other way he could. I also found out that his partnership with Strohm had terminated in the past week because he found out Strohm had been defrauding him too. He also screwed over the 98 AW con people also and several other minor people and businesses. So it was a pretty widespread thing.
So what to do? I couldn't get a refund. I couldn't negotiate or deal with him to upgrade the PC to include the right perpherals that should have been in there. Call the police? Sue him?
Nope. All of that would have cost more than the $1900 I'd spent for a substandard PC. Instead I, as I imagine many scammed by Voss did, get my pound of flesh by bringing his name up every now and then & ostracising him. Alerting anyone who shows an interest in buying something from him that he'll rip them off. KenJR is still out there in the WWII flightsim community afaik. In FA I think. But over the past 6 years I know I cost him far more business than he ever made off of me. And that serves as my justice.