Hi, I think that pagerank really means how high of a priority the googlebot has to crawl those pages. For instance, in my sitemaps area it shows that about %55 of my pages have been crawled, most of which have low pagerank or none yet assigned. I'd like to believe that pagerank means how often the bot will visit your site I/O how valuable the page is to the bot, not search results.
I look at it this way (chicken and egg issue): The higher PR pages aren't assigned to be crawled more often. Higher PR pages have a higher PR because they either have more links from more pages or higher PR links. If you ever studied how crawlers work, you know they put links to spider in a queue. They crawl a page, extract the links and add them to the queue. So your higher PR pages are in the queue more often because they have more pages linking to them (or higher PR pages linking to them which means, they on their turn are crawleed more often).
Don't think so. Googlebot hit my website just slightly less then 50000 times in the space of 10 days. I had to ban it as it was really sucking bandwidth. I've only today removed it from robots.txt. That 50000 hits/crawls did nothing for my website. Still PR0 and nothing showing on Google.
Unusuall. Is is with that site in your signature? Huh... It is highly optimized for AdSense. Dynamic using of search engines is... let's say unpropriate. You should cache it anyway. BTW, your site is typical MFA.
PageRank definitely has something to do with how often a site is crawled. PageRank is one measure Google uses to determine how important it considers a site.