This is part of the answer that I gave to “Alexander, Marlborough” on Jan 9th and I think it might say what you need to know: “Just because you pay up front does not mean it is shared out to all in sundry. At the end of the cruise you will be given some slips, by placing these slips in the appropriately addressed envelopes and giving them to the correct people you will ensure that they are correctly recompensed. These slips are the equivalent of vouchers to them and they hand them in and the subsequent amounts which are recommended by the cruise line, and in the brochure, are giving to them. It is the same as giving them the same recommended amounts in money. So stop worrying about it, the money you pay will go to the right staff members because you will in effect give it to them” ....Nei.