I don't run any but use them do use them occasionally. I thought they were illegal?, i.e. copyrighted materials.
The funniest thing I saw was on one of these sites: "example.com is not responsible for any content on this website". Well of course they are responsible, they are the ones that uploaded it to the net
I would not get involved with these sites. It was interesting with the recent case with thepiratebay.org, I think these sites are similar in the way that they are profiting from illegal content.