If you scroll to the bottom of the very long Experts Exchange page, the question and answers are down there. While I realize your question was meant to be rhetorical, EE has answered my question a few times, and I want to say that they do provide some value, which I suppose is reflected in its page rank.
Yeah, I realize if you scroll all the way to the bottom and ignore all of the up-selling of premium access, you can see the real answer, but their pages are designed specifically so that you don't notice this and don't bother to scroll so far. I just use Experts Exchange as an example because they seem to be another company that uses SEO gaming techniques to get a PageRank that isn't really justified based on their content.
I'll admit, I have gotten an answer or two from EE, but at the same time I also wonder where they stole the real content from. These companies that do SEO rarely generate any real content themselves. They all violate copyright in flagrant ways.
