The success of their marketing or of actually getting people hooked up? If they were so successful then they'd lose all of their customers because they would no longer need the site...

> I’m not saying its ever going to be 100% accurate but if we can determine that x guy and y girl live happily ever after 85% of the time if they share z traits that still gives us the ability to match people far more successfully than we do now.

Go ahead and even begin to try to find data to back up that big assumption. No metric with such high correlation exists. This is my point.