Warez - What's a developer to do?

I know of several warez websites. I have browsed their FTPs and saw all of your (the devs at PM) software, free for the taking. Registration codes for Strategic Assault, cracked versions of Dex-plor, Snails version 1.7 and all the levels, Argentum, and many more. Most warez sites use FTPs, but I've seen a few HTML sites with direct download links! My question is, what's a developer to do? One PDA warez website I went to had over a 1000 registered members! That's alot of loss profit, even if only 20% percent of them would have bought the software. How do these sites stay afloat? What if any legal actions can be brought down on these sites? Do developers even know of these sites? One site I saw had a deal with a developer to only warez there software after 30 days since it was released! So please tell me, what do you as developers think of all of this?