And yet people are totally willing to contribute to servers earning much more than $50/hr in tips (on busy nights). $50/hr spread across a lot of customers work

And yet people are totally willing to contribute to servers earning much more than $50/hr in tips (on busy nights). $50/hr spread across a lot of customers works out to not actually being that much per customer. Admittedly this is relatively expensive sit-down restaurant service we're talking about here, which is different from the fast food market.