I'd tell him not to worry about his PR, it has no effect on the site's placement and ultimately that's more important. Case in point, one of my site's has had its PR halfed in the last updated. However, traffic via Google has nearly doubled. The only people who really care about PR are link sellers and buyers, increasingly, a risk process given Google's current war against such practices.
The low quality directory links probably will give you a short term boost, but long term, concentrate on getting quality links from authority sites - it's far more beneficial in the long run than the amount of PR you have.
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