goodroi - 3:10 pm on Nov 3, 2011 (gmt 0)
Correlation is not causation.
Simply having high Pagerank does not guarantee rankings. Sites that legitimately have high Pagerank tend to have more links and those links tend to be higher quality. These sites also tend to have higher quality content which attracted those links. That higher quality content tends to generate good usage signals. The Google ranking algorithm looks at over 100 factors which includes links, content, usage and many other signals. The combination of those factors is what leads to high rankings not Pagerank.
ps You do not even know what your Pagerank is. No webmaster does. We only know what our toolbar Pagerank is. Google does not release accurate Pagerank data to the public. Toolbar Pagerank has a long history of being outdated and manipulated.