Google demands????? LOL I never ever use nofollow on any sites (50+) and each and everyone has PR. Google cannot dictate how to run my business!!!!!
Right and its been guidelines for over a year now so what is your point in posting something that has been posted 100 times already?? Please dont post things just to post......
Google is smart but they are not smart enough to do that on their own. Google will rely upon reports submitted by whistle blowers. There's a link in Google Webmaster that allows people to report paid links.