When we went last Sept. the bill had a suggested 18 percent. but it is up to you .... all you haters just back off... if the service isn't good I won't tip 18 percent. We had an awful waiter at the Crystal Palace and at a buffet I at least expect the used plates to be picked up and a fresh beverage isn't out my expectations. He got 10 percent and that is just because I felt guilty about leaving less. People around us with a different server were taken care of well. If this gentleman felt slighted I hope he got the message. They should not expect prime gratuity for poor service. Otherwise your bill will have the amount on the check that your meal would have costed if you were paying cash instead of using dining credits.