Its not neccessary to place link and If you want use your website to earning then not place it and your purpose for doing link exchange then ofcourse go with this.
I have a "link to us" page from back in the day. 6 months ago I cleaned it up to find that most reciprocal link partners had deleted my links or were no longer in biz or had changed their websites with no links pages. The point is add one if you want, don't if you don't. Reciprocal links are not bad, not particularly worth much but most say a link is a link. I have added one link to a very good related site in the last six months and I am about to add another. I think about 3-4 every six months from fairly high pr sites will about do it. Will spend the rest of my time getting one way links like crazy from pr0 to pr5-6 and a rare 7 if they will have me.