I suspect(I could be very wrong) that a lot of people do the majority of their dating & find their spouses in college, so the dating prospects are almost as important as the quality of education. Just like how nightclubs reduce admission or drink prices for ladies; thus drawing more ladies and of course the boys follow... college is, wether they like it or not, is the main place to "hook up". It's just statistically higher quality than the random person at the bar/nightclub.