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I link out to over a thousand Homeless Widget Shelters and only about five of them link back to me. (The directory was built before I ever heard of PR)
Now when I add new links I do ask for a link back but I don't push the point. I just started asking a few weeks ago after hanging around here.
My PR is 5 on the index page, down from 6 a couple of months ago when just about everyone took a PR hit from what I gather. That sounds kind of low but I looked at other Widget Welfare sites about a week ago and couldn't find any that were higher than a PR6 so I guess 5 isn't really that bad.
I figure that my visitors are getting the information they need and it is entirely too much trouble to hide the links out from Googlebot so unless I drop even lower than a PR5 I'm not going to worry about it.