Your wrong, their focus is places where the sole purpose is paid links, like directories where every listing is a paid link ... link farms.
All sites have links, banners, ads and Google themselves sell paid links, called Adwords.
So report away, nothing will change.
Rel=nofollow is on all outbound links here unless arrangements are made to remove it. So in essence what you are saying is that if they all were normal links without that screen Google would value the forum greater? But which way is it likely to be the bigger link farm?