The top level domain has a pr7. They sub domain above had high pr to, but now is gone. The subdomains came from the ashes to be top of the 2nd page results. If you look at the pedago site. It has a sponsored links section which links to sub domains. I wonder if some one bought those bottom links and set up the sub domains.

If you look at the Washington times site. The advertising links at the bottom of the page are throught a different company. They bought a footer space and sale links. Then on the right the market place is where the website sales its on links. By there rank no one seems to care if the sale links.