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If you've got the same amount of info on just 50 pages and the PR is higher, they may not rank as well as there isn't a specific thing that they are targeted to hit.
There is a LOT more to the variable than PR. In fact, I'm of the mind that PR is used very little in ranking a page in the SERPS, but rather it's a measure of power that page has to help a page that it links to in the SERPS - among other things like "depth of crawl" factors and such things that don't effect rankings directly. (Others will disagree, but that's my belief).