indyank - 5:31 pm on Aug 6, 2012 (gmt 0)
yes netmeg we are indeed talking about two different things if not more.Even the first one that you had mentioned are dynamically generated and do have the same content, say 10 products relevant for those searches, arranged in random orders.Each of those products will have a line of description (most times partially cut off) and other stats about them like the number of views, etc.
From whatever I have seen, these sites don't use the term "search" in their url structure and the structure is more like "site.com/s/this-and-that-for-the-other". They also don't use the word "search" in the title tag, though they would mention it just outsite the h1 tags but styled as h1 tags. For example, "<h1> Widget </h1> Search results"
You are right that google could easily detect these but the fact is most of these are high authority sites and so we are always going to find custom adsense codes on them.