You still tip at your normal percentage. If you're spending $150 on a meal everything about it should be much better than the $20 meal at Waffle House, and this includes the service. At Waffle House you tell the person what you want, and they grab it and plop it down on your table. At a nicer restaurant, one would expect that the server know more about the food, be more attentive to your needs, suggest wine pairings, etc. Basically, 20% quality service at a nice restaurant is better than 20% service at Waffle House, thus it costs more in real dollars. But at those places, the waitress is busting her ass trying to manage a ton of tables and make sure everybodys coffee is full. So you are going to tip her 20% on your $3.99 grand slam. That isn't even a dollar. She would have to be juggling at least 10 tables of two people to break even with a guy working at a fine establishment waiting on one table. One person is running around busting her ass and another looks down his nose at people who don't go with his wine recommendation.