Desperate or...desperate?

You always see commercials for the online dating sites like E-Harmony and Match.com or whatever.
Now please, explain to me why people use those.
Are they really so desperate?
Clearly they're insanely uninteresting or just intolerable if they can't find someone offline.
Not that I'm much better myself, but at least I'm not one of the 'thousands of people' who have signed up.
-Sigh-
Get a life.