pr is only any use if your gonna sell links from your site other than that its a waste of time you don t gain anything else.
I think many people are still confusing PageRank with the public graphical representation of PageRank. Some people may use public (e.g., Toolbar) PR as a measure of the value or worth of a site when buying or selling text links. That's your choice of course but at least realize that it's not an informed one.
Another debate on pr in this forum ! Pr is useful for link exchnage, link sale and for directories. People here are most worried about search engine ranking.