Yeah, you are right. The gambling industry is a productive sector and one of the fastest-growing sectors in the world. Basically, gambling is a form of entertainment that can satisfy the desires of gamblers. So it is natural that the gambling industry can provide income to the government, because it can attract many foreign tourists and even has the potential to attract foreign investors.
Even if people do not know about gambling and not playing gambling before, they can easily visit the local casino by coincidence. With having so many promotions in that city, it could attract people to visit the casino, and if the casino can have in one place with the other place such as malls, local store, that will be more a good place for tourist.