About ten years ago I signed up for several dating sites. Okcupid was the best at matching but Match.com, despite inferior matching, was better for in person meetings. My guess is that this was because Match.com had a monthly subscription fee while Okcupid did not. The meter was running, so to speak, and people were more direct and wanted to meet up after a few email exchanges. On Okcupid there was no penalty for dragging things out other than the possibility of the other person giving up or getting into a relationship. I wonder if some of the dating services where the matching is done by humans rather than programs are successful simply because they're expensive which filters out the casual tire kickers.