Originally Posted by Duncan Pollock

The sites are well done enough "above the fold" and I'm sure they owe their favourable appearance to this fact. What's wrong -- and to most reckonings a prime example of Black Hat SEO -- is all the keywords at the end of the screen.
Eventually, the search engines will probably notice the fault, but the sheer volume of listings (how many millions/billions is it now?) limits their ability to catch the bad guys. Meantime, there's no reason why you shouldn't report things to Google et al, is there?

Duncan