I remember a while ago I was scammed of $50 for a graphic design but after pursuing the individual I recieved all the money back. Then there was the incident with a programmer (Jeremy Johnstone) who tried to steal $100 of mine, posting in public really does help
I would say the biggest incident related to being scammed came when a user paid for a bunch of templates with a stolen credit card, they paid me $1,000 for about 8 of my designs and this nearly got my paypal account locked.
What's the most you've ever been scammed by?