Normally I wouldn't bother because frankly I don't think sites like this really hurt this scene. In fact, while I don't condone it or want to see it I tend to think it might actually help a little. First of all, I don't think very many people really use these sites unless they live in Russia and/or are using stolen credit cards. Secondly, I think any exposure is good exposure at this point.
It probably does hurt the big labels a lot more though... if they're selling 1,000s of Britney Spears that's one thing... if they're selling 1 or 2 Numina that's another... and hopefully the people that buy the Numina stuff will seek out more and purchase the hard copy package with the artwork, etc.
That said, I'm glad I got it down and will continue to work against the illegal sites (at my leisure), but I just really don't think it does a lot of damage to ambient, specifically.