I noticed that some of the buffets mention in the reward terms and conditions that the second buffet must be purchased by cash or credit card. Room charges will not be accepted. This is at MGM Grand and Mirage. I purchased the Aria 2-for-1 dinner buffet and it doesn't have that stipulation in the terms and conditions. Anyone in the know as to whether it can be a room charge if it doesn't say that it can't? I have some food and beverage credit that I will want to burn up but won't use the Aria buffet if I can't charge the second one to my room.