Nice chart. I love when they break things down like that and can confirm that the graph with the girls is authentic (been out with 2 of them)
One thing these numbers don't take into account is that when people pay for something they're more likely to take it seriously. It's anecdotal, but my experience with hundreds of dates over the years is the women are less flaky on Match vs. OKcupid. It's a case of having to develop a good flake-dar, such is the price you pay for free.
Saying that, I'd never want them to go pay, I hope OK and the like destroy Match, they're just better companies with better ideas.