premise: The practice was brought into play with the introduction of specialty restaurants , but some cruisegoers would rather dole out gratuities themselves . Question : After booking a cruise with Princess Cruises and paying for it , I learned that $ 11 a day per person would be added to our stateroom bill for tips . For an 18-day cruise , that adds up to $ 396 for two of us . Why was $ 11 per day being charged ?
hypothesis: booking fee