I agree to an extent Linda... Yes we always pay them and many times give extra to those that provide great service but I don't think they should be included in the price. They are (at least at this time) considered a gratuity so they are removable or can be adjusted. If they forced you to pay them as part of your cruise fare then they no longer be a gratuity, they become a true surcharge and then the motivation for working for the tip is removed.
I would like them to make it better known that this charge is going to show up when you book a cruise so that you can at least see the total cost.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007