I would never remove a link to one of my link partners unless there was a compelling reason to do so (such as the page that I link to becomes penalized).
Today's PR3 page might well be PR5 or higher in a few months. And 50 links that each produce 2 unique referrals per day (on average) provides 3000 unique visitors a month.
But I do believe that after your site is fairly established you need to work toward getting lots of unreciprocated links. I'm pretty successful at this by offering something of real value for free, including software, ebooks, and advertising (most of which costs me very little or nothing at all to produce).
Reciprocals are best used for jumpstarting your link popularity. One-way links represent the next level in linking strategies. And believe it or not, if you have something of real value to use as a carrot, one-way links are easier to get than reciprocals.
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