Nope, the useless value of toolbar PR might, but but REAL PR (the one that counts) most definitely isn't.
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It is an exclusive and excellent way to know about a site on how good it is. A site with higher PR is as good as it increases.
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Not even close, Toolbar PR (which is what you are talking about) is a totally useless metric. It doesn't indicate ANYTHING at all about how good a page is. It is simply an inaccurate snapshot of what the REAL PR was at some point previously.
By the time you see the toolbar PR it's already changed.