Well, to be dropped from PR10, to PR6, I would be frankly devistated. Maybe a 1 maximum 2 drop in pagerank, but 4? That's sad. Surely by google lowering the pagerank just because they sold links on their pages is going against the point of the algorithm? Or, were they buying in links to increase their pagerank?
They still are PR9 in some data centers. http://www.digpagerank.com/index.php?url=www.statcounter.com&dc=18
PR updates has just started on data centers... It will change, unless the PR updates are finish then the PR on the your toolbar will tell your external PR...