I did just that: called someone on posting entire scenes they got at another site (I posted the link to the freebie), accepting compliments on their modeling skills, when all they did was render it in an expensive engine. What I got for my trouble was the "artist" going through my entire gallery and slamming every image. I had to disable comments to make it stop. And the official support I got? "Don't dish it out, if you can't take the heat."

Lesson? It's not worth the headache.