I don't know about the piracy of music or movies but kazaa provides at least one essential service: the distribution of PORN! It's amazing what you can find on Kazaa! :-)
Although I admit I have a few mp3's off Kazaa I'm not a fan of mp3's in general because I'm a bit of a snob and like to listen to my music on my high-end system without the thought of all that lossy compression going on... which basically means you could count the number of mp3's I "stole" on your fingers.
From a moral point of view, well, I like to think that I have no morals, however I do find a particular value in buying the things that I like. I think that value is that people who steel look cheap and I don't like to look cheap. Weird but true.
- Mike