It seems like the more we gamble, the more we're pushed to keep going whether we win or lose. Over time, gambling can become addictive, and we feel the need to keep finding more money to use as capital. I do agree that some people can maintain good self-control when it comes to gambling. For example, I set a monthly limit for myself, and once I've used up that amount, I stop and wait until the next month before gambling again.
Honestly the addiction that comes from gambling at some point will definitely need some extra help or form of discipline to overcome because with gambling you get to have fun and at same time make some cool cash for yourself so on a good day it's a win win for you and on a bad day it's a loss, two extremes you will have to suffer on both days.
Maintaining self control may not seem easy and yes ofcourse it actually isn't but again you can get it if you put your mind to achieving such. You do not only gain control, you also determine what you want at almost any point from the casino in terms of fun and the kind of loses you get to suffer because most often you can't control the wins.