i don't think any artist really supports file sharing.
in my opinion, fuck the artists.... in most cases what they put out is crap and not worth buying. There are exceptions though (tech being one of them), there are some artists who consistantly put out good music.
File sharing does help artists. I listen to a lot of underground hip hop. If i didn't download it then there would be no way of me ever hearing of it. If i like it, then i will definately buy it because i feel that they deserve the money for putting out quality material.
"of course that's just my opinion, i could be wrong."