[hirsin]

This should be free. They're either passing up on the money restaurants would pay to bump numbers on slow nights or getting you coming and going, as it were. (There's certainly the possibility that they want to stay ethically clean, but the cynic in me says a random startup I know nothing about is, well, a cash strapped startup).

This isn't to say that they shouldn't take restaurant money, there's certainly precedent for it and people love Yelp. Being transparent (or simply keeping quality up) would be a good check.