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It looks like you have a combination of the regular monthly crawl and the so-called "fresh" crawl in those statistics. Is the "fresh" crawl getting the same pages from one day to the next?
With your PR7, it started getting serious on the monthly stuff on June 2. On my PR6 site, it started getting serious on June 5.
Thanks for your input. I don't think there's any doubt whatsoever that "deep" sites on the Web don't have a snowball's chance in hell of getting all their content in Google unless they have a healthy PageRank to begin with.
Case closed.