Normal
You might have the miss understanding that the room service delivery person is included in the tips charged to your onboard account. They are not. The dining room wait staff and your room steward are the people for whom this tip is destined. You should base the amount you tip room service on the amount of food you order. Simple stuff $1, full dinner for 4 that takes 2 carts to deliver $5 (at least). You be the judge.
