I really don't care what they are "expecting". Actually I was just at what is oxymoronic, a moderate priced restaurant on the Vegas Strip- $40 entrees, and for a party of 7 they added the tip, as expected, and only 18%. And I strongly object to using the post tax amount for the basis. Sales tax is for the state, as someone noted, businesses don't charge it, they collect it for the state, and it has no relationship to the meal served. I was talking about tipping more at Denny's but does the server work any harder to serve you a $50 bottle of wine than and $500 bottle, or do they just have a bigger grin because of the tip they expect and had how much work is that anyway and you are going to tip $100 to bring a bottle to the table.? The whole system is insane.