Casino hotels comprise only a tiny fraction of hundreds of thousands of hotels across the world. Perhaps due to this limited scope, the industry lacks universal performance metrics, and casino customers might find frustratingly varied booking experiences across different brands. The ongoing legalization of gambling-related activities, however, has fueled growth in the commercial and tribal casino industry over the past few decades. With casinos now in almost every state in the US, knowledge about gambling operations, loyalty programs, and marketing tactics is increasingly prevalent. Gaming operators have long expanded into other hospitality industries and, recently, online. Resort casino properties often host a vast array of offerings, including gourmet restaurants, spas, golf courses, and of course, hotels. About 30 percent of almost one thousand casinos across the US have a hotel on site. In most cases, the hotel is viewed as an amenity to the casino and not the other way around.