I suspect the majority of people are more interested in finding someone to love and care about them; than they are interested in finding someone for (them) to love and care about.
Even on HP I've seen numerous questions and hubs asking: How can you tell if someone really loves you? or How to tell if a guy is into you?
Love is a gamble and no one wants to play the fool. Most people are afraid to trust and you can't truly be "in love" with someone unless you completely trust them. People tend to want the kind of the love that they are unwilling or unable to give.