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The amount of PR passed to the other pages will be reduced because of the number of pages and links involved.
If you break the amount of links down to a handful of categories (let's say 10) than each of those category pages should get a TBPR of 4.
The further deeper linking will reduce the TBPR another notch.
You can get deep links to these category pages from other sites or even deep links to the individual pages to increase their TBPR if it makes you more comfortable.
I see many pages in the #1 spots that have a TBPR of 1 or 2. The home pages of these sites do have a higher TBPR value.
I un-installed the toolbar over a year ago and left the green pixel chasing to others. I go for good ranking and not TBPR as they are 2 different things that may or may not be related.