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As far as the 1 site with a PR0 they are probably either new to yahoo or have run into problems and been banned ...
I've read quite a few posts from people disappointed in their "traffic" directly from yahoo directory, I would recommend that you balance the listing you want in yahoo, with the PR of the page it is going to be listed on ...
You say the page you are looking at is a pr5, a pr6 or pr7 would be more valuable if it is close enough related to get approved ... also be sure and go to dmoz.org and try to get a listing there ...