I just read this in a Celebrity Retreat FB page - thought it was good info
Hi dear cruisers
I'm Zlatko, a former cruise ship employee.
Being in more cruising groups and reading the complaints from the people about raised charges, I decided to write a few words and one piece of advice- Cruise vacations are still affordable for most people, so book one and enjoy all the benefits. The value you will get for the money you spend on a cruise is not comparable with anything else. Friendly and well-trained crew, food included, room cleaned every day, different kinds of shows in the theater and the other venues, open and closed pool, a few of the most beautiful places on earth visited.....
About the GRATUITIES. An average cruise ship costs close to 1 billion dollars to build, and operating that ship is a huge expense, too. 80000 (Eighty thousand) gallons of fuel spent in a day, 20 trucks of supplies every seven days brought on board....... Whether the gratuities should be included in the cruise fare or paid additionally, those 15-20 $ are crucial for the cruise line. Please remember that when you go to the guest relations to cut that expense, you cut from the salary of the service crew.
Considering that you won't meet at least half of the service crew, canceling and giving the gratuities personally to a few crew members is not a good idea, either.
Tipping crew members has nothing to do with the gratuities, and it's always welcomed when possible.
Stay beautiful