I have all kinds of crap in there. There isn't a way to really track it. When i started it, I saw a little increase in the sites traffic. By looking in the stats under no reffer.

I would think that kazza and those type places would mostly be people looking for free shit. I know I use them when I'm looking at new studios for my distribution company. I find the studio name, then find a few clips of them in Kazza. Watch them, and the delete it. If the clips are good, I'll order their movies.