> More people dining means more profit probably. I gave a precise argument to why I think tips do not increase demand for the service - most people in the US,

> More people dining means more profit probably. I gave a precise argument to why I think tips do not increase demand for the service - most people in the US, regardless of wealth, pay at least the minimum tip. GP's argument that there is a substantial price segmentation would only hold if poorer people did not pay the tip.