I don't see it that way. I figure someone patronizes a restaurant because that restaurant ran advertisments that enticed a patron to come in. A patron doesn't sit at the table and then decide based on what the waiter tells him whether or not he'd be a paying customer.
You're wrong.
It may work that way at McDonald's, but when the choice of entree, an extra app or dessert, or a couple of extra cocktails can easily add $100 to the bill, I will hire the most ambitious waitstaff I can.