Not to detract from this thread, but I see forums where people say in their signature, "Please say 'thanks' to keep this topic alive!". Warez forum posters do this as it keeps people downloading the files from the files-storage they uploaded them to.
Every time someone posts to say 'thanks', the thread they started hits the top of the forum again, and like the snowball effect, more people see it, download the files and thank the thread starter.
And yes, you guessed it, they get paid for people downloading these files.
Maybe that's the forums you see; I hope those are the forums you see! - if not, then are they actually just wanting the "thanks"??