Why companies?

I never quite have understood why the mainstream press concentrates so much on what companies are doing. For example, see Jon Brodkin's NetWorld article, wherein he talks about nine open source companies to watch. Maybe they write more about companies with funding because they're the people more likely to buy advertising than nonprofit projects. Yes, I'm aware of the so-called wall between editorial and advertising, but that just says that editors can write whatever they want, even about advertisers.