I agree with Larwee that PR is something that is not a main concern, but it is a by-product of proper SEO and tends to give an overall gage of your seo efforts when comparing to your competeing sites for your respective keywords.
There is an additional plus to pr when considering adding new pages. You know that you can default the page in if it is directly linked from an authority page on your site like an index page with a PR 4 ofr better.
The main thing you should be concerned with is building top quality links to your site, and one way links at that.
PR will take care of itself if you build your program properly.
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