I'd say (although maybe I'm unqualified to do so... :) ) that although it may hurt, it can also just lead to a happier lifestyle. And happier people, it seems to me, would be more productive, both in the short and long run. So while relationships may hurt people, the hurt would be short term, while the overall happiness and productivity gains might be long-term.
----- Oh, and by the way. It took me login to post, because I didn't realize that the ID's were case-sensitive. I'm not sure that they should be, eh?