Betting houses are businesses and, of course, want to make money. But when a customer becomes addicted, they eventually stop betting because they no longer have money to spend. In other words, they stop being profitable for the house. Furthermore, no business wants to be known as a place full of addicts; this damages its reputation and, ultimately, drives away other customers. That's my opinion.
For those addicted to gambling, I don't think it's easy to stop. Even if they run out of money, they'll likely borrow money from friends or relatives. Worse, they could engage in excessive behavior that could harm others, as addicts tend to be willing to take high-risk actions.
These addicts can be considered a long-term advantage for casinos, while those who gamble with good self-control won't be.
Betting houses are interested in making money; however, they also need a stream of clients and not just addicts. In the short run you would get more revenue with addicts, but in the long term the vice can cost the business even more revenue and credibility.
It is challenging on the human side of so-called gambling addiction. Although a person may run out of cash, the need to spend more money may force him or her into borrowing and dept as well as other personal complications. This may be beneficial to casinos in the short-term, but is a destructive cycle to an individual. Individuals who gamble responsibly do not pay off as much in the short term but they make the system sustainable. I believe that awareness and support are the main problem that needs to be solved since addiction harms no one in the long term.