 You know those mega ships that sail with thousands of passengers? It might surprise you to learn how much passengers win or lose in the onboard casino may determine whether or not the cruise is profitable. I'm Rudy Max with today's Travel Minute from Rudy Max's World. Cruise lines are offering low prices since several enormous ships came into service this past year. They want to put heads in beds because they have a secret. They often make their money on the ancillary stuff. Don Hanrahan, CEO of Celebrity Cruises, says 30% of the company's revenue comes from onboard spending.