There was an article yesterday in the Boston Globe yesterday called "Are too many choices spoiling our chances for finding love?" Here is the link.
Basically it's a scientific fact that when people have too many choices, the suffer from "information overload." "A few years back I read Barry Schwartz’s The Paradox of Choice: Why More Is Less, and in it he says that choice is a good thing, but we pay a price for too many choices in our lives. An overload can leave us feeling stressed and dissatisfied, even depressed, says Schwartz. It can prevent us from choosing, because we fear something better might come along. And it sometimes makes us regret the choices we have made."
This supports my theory of one problem w/ OLD is that people are afraid to commit to one person because of the fear that someone better might be on the site so they better keep looking.