Rings a bell; I remember a similar idea coming up in the past. You could work out affiliate deals with bars and restaurants (or other activities, I hate going on dates to bars).

I think the idea we threw around (it might even have been here on HN) was a sort of clever matched blind date (to avoid the problem of people just bypassing the system :D) rather than a "normal" dating site.

There are privacy/stalker and scale concerns there though.

Certainly worth exploring.