Page Ranking and Importance of the Site

I would greatly appreciate your opinion on the following. I am trying to figure the dependence between the number of incoming links, the total quantity of indexed pages and the Page Ranking.

I was recently told by Google staff, that “Google tends not to crawl very deeply or very often lower PR sites.” However, I have found some sites on the internet, which were spidered very deeply (2,000 pages) and did not have any incoming links at the same time.



Could you please comment on this contradiction?

they have incoming links, site without inbound links wouldn't get to Google at all(They just not shown becuase pages where these links are doesn't have high PR, if I'm now wrong links on the pages lower than PR 3 will not be shown as inbound links but would be taken into account)
And yes PR mainly depends on the quality and quantity of inbound links but it's not the main factor for ranking, it could influence on quantity of spidered pages but e.g. if you do simple test like type in Google: search engine you'll see on the first place Altavista's SE which has PR 9 from what I remeber