Red Hat has a very tough job ahead trying to sell something they are simultaneously having to give away for free. Just like when the Chinese government takes "Red Hat" and renames it "Red Flag", without a dime back to Red Hat. And it's a growing problem for them. From today:
Attack of the Red Hat Clones
http://internetnews.com/dev-news/article.php/3488781
Redhat paid 0$ for the os, if not for Linux they would not even exist. They still get continuous development from the community (you think they keep SAMBA up to date?)... All and all the GPL has been a good thing for them...