In reply to Bob Schecter.

Envato is kind of a special case Bob. You tend to get what you pay for, and I'm sure you can see how their model has tended to work. Whether you are buy plugins at Code Canyon or (preferably) anywhere else, take a look at the developer -- who are they, what are their creds, what's their track record, and what are their future goals? Do they even have a personal site or organized company?