In Las Vegas parlance, a whale is an elite class of gambler who wagers an average of US$100K per bet. In an effort to attract these exceptional high-rollers, casinos build ridiculously lavish hotel suites for these gamblers and keep them available in case a whale is spotted in town. Even though a casino could easily rent out some of their palatial suites for over US$10K per night, they prefer to let whales stay in them for free, since a whale could easily lose over a million dollars at the gambling tables in a single weekend.