I was sondering about this yesterday. My last girlfriend, before she met me, had signed up for one of those Chemistry/eHarmony/Match.com sites.
She told me she had a few dates and they were catastrophes. They had nothing in common. And she paid money for this!
I'll bet not one person out of ten thousand finds a mate on these sites.
Out of curiosity I once took the test at Chemistry.com. They asked questions about the ratio of my ring and index finger (men have longer ring fingers due to testosterone in the womb). I consider such a ratio irrelevant in a relationship.
They asked one question each about politics and religion -- which I have found to be exremely important in relationships.
I'll bet the owners of these sites are making millions off of lonely desperate people. i'll bet they pay for a month and then let it lapse. But if people are signing up every day, well, there is a sucker born every minute.
i'll bet I could do a better job as a matchmaker than these people.