Look up Orman Clark from PremiumPixels.com. He's sold well over a million dollars on ThemeForest. Unfortunately, the marketplace is now filled with a lot of get rich quick schemers. I know they're (Envato) trying to work on cleaning up the community, but it's going to be a challenge as the market grows. If you want to be successful on ThemeForest in the long-term, I suggest building your own brand to co-exist with the marketplace. Orman serves as a good example of creating a brand differentiated from others. His sense of design is incredible and his success is well deserved.