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I buy Run of Site traffic in big quantity from various pay per click search engines like kanoodle, mygeek, goclick, epilot, these and their affiliates generates static html pages with links, google crawls and see our link appear on thousands of static HTML pages, pages about everything and nothing... some pages just collections of paid links...
If this is why we dropped from pr 6 down to 5 i gotta stop using these ppc's like i do today, because the amount of "real" links has increased (i know) so there shouldn't be a reason to drop down in PR... yet google dropped us from 6 to 5.
Could this be it?
Lars
PageRank is calculated based on total web pages (or total web pages that Google knows about anyway) which is +3 billion.
As this number increases the value of any single link will depreciate in PageRank(should no additional links be added to improve or maintain the status quo). At some future point a Google-know web could be 50 billion pages and realistically many sites with millions of inbound links but still only receiving PR10 (or PR11 as it turns out). Therefore a PR6 today with no improvement will becaome a PR5, 4...
A penalty is still possible - but suspect unlikely since the page still has fair PR.
Other possibility - someone else was banned and no longer counted to you.
Server outages... during Google crawl - which may rebound this update.