Absolutely nothing is too far IMO. It's data from Google and so can be interesting, given the right evaluation.
But the toolbar doesn't seem to be any indication of whether or not a URL has external links or references of value. I don't think it's even based on the same calculation as PageRank, and certainly undergoes lots of changes even if it does.
To me, PageRank (toolbar or otherwise) only matters inasmuch as it relates to whether a URL has received value and the URL's ability to pass on value.
It's possible to get a high PR without the need for a page to either receive a great deal of value, or be able to pass on any value. Whether you care likely depends on what your results are ;)