I have been on the net since AOL 2.0 and can't really think of any time I've been "scammed".
I'm not sure that I consider not being paid a scam. When someone rips you off like that, or steals from you, that's not really the same thing as a scam. They are scum bags, and you can't prevent people from being scumbags. When I hear "scam" I think like MLM, Pyramid stuff, fake lotto, someone stealing your info and getting into your Paypal, etc...
I work primarily online these days too.