PageRank is only useful when you want to market the "SEO value" of your site to other people if you're doing something like selling links. Only because people still think it's a valuable metric. And for that purpose, it's great.
But if you're actually looking to gain authority with search engines, then DannyA has the cogent advice: get links on pages that rank high for the keywords you care about. If a page fits that qualification, then you can see why it doesn't matter that it's PR0.
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