At page #70 you will see this disclaimer:
In order to show you the most relevant results, we have omitted some entries very similar to the 692 already displayed.
If you like, you can repeat the search with the omitted results included.
Very few people will actually go that deep into the result pages but this raises an issue of search accuracy. Are Google users influenced by the daunting amount of search hits that Google claims to have found? Is this the reason why users do not go deeper than the first few pages of results?
What if searchers knew from the beginning that the search would be displaying 692 results only as opposed to the 2.5 million it claims? Would that change our searchign behavior?
It would for me. If I knew that the information that I have to scan through is 70 pages long I would take the time to go at least to page #5 of results because I would know that the search is finite, measurable and comparable by the human brain.
692 vs. 2,5000.000 makes a big difference searchwise.
brrreeeport by Scoble is trying to measure the efficiency of a search engine. See it for you self.