Providing a gratuity for good or excellent service looses its personal meaning in a prepaid or fee based program. I enjoy paying well for genuinely friendly, and conscientious service at an appropriate moment during a cruise. At the same time, I believe the staff enjoy the personal recognition and sense of one-to-one appreciation. Those occassions of recongition help sustain some happy memories. So, I'll take care of my wallet and those who provide service in keeping with my optomistic expectations, and I'll say "no thanks" to any purser that wants to intervene in my rapport with the ship's crew. The money and "thank you" are not about a line item charge on my Visa. It's saying "thank you" face to face and meaning it.