Cruises exist on a different plane and operate under a different set of rules. Each vessel functions as a company within a company, constantly evolving as its 'software'—the crew—rotates and adapts. More importantly, cruises operate miles from shore, under circumstances that are vastly different from their land-based counterparts. While the fundamentals of onboard revenue remain the same as those on land, there are several differences that make revenue onboard an art of its own. These are the...