I don't know if we need a reason for here because that could be different from one person to another person.
I don't want to gamble if I don't have time to waste because I think I will use that time to do something else. But so far, I still have more time to spend on many things, including to play gambling.
It is better to use gambling for entertainment and don't use gambling as a way to make more money because they will know that it will not possible to do in the long term. Soon or later, they will see that they will lose their money without takes too long. Some of them will realize, but some others will not, and that will make them feel hard to earn money from gambling. Making money from gambling is normal, but we cannot depend on gambling to earn money because we have the other way to make money.