Cruisegus….you are absolutely correct! I have asked our stateroom guy that question before. He said they are given a list of passengers that get their gratuities back. Also, yes Speciality restaurants add an 18% gratuity when you purchase a dinner. What you need to know is that the 18% is divided up between every worker that works in that Speciality restaurant. I have asked this question to confirm on two different cruise ships. The extra you tip for your good service… that server gets to keep all to himself.