So, in this case, we already know our limits and try our best not to exceed them. I can't deny that sometimes I even have thoughts of continuing to gamble or increasing my budget when it runs out. This kind of discipline is what we must practice, because allocating a budget will be in vain if we aren't disciplined in implementing it.
Needs must always be the priority. Sometimes I don't hesitate to stop gambling if I see my needs increasing that month. And I'll come back the next month.
Knowing our limits and trying our best will not make us exceed the limit. We will know when to stop gambling and will not deposit more. But as you said, we may be tempted to increase our budget, which also happened to me

But I directly remember that I can not do that. Otherwise, I will only waste my money, more than I can afford. That will make me leave in sadness without knowing if I can win or not. But the loss will follow me and take away the chance to get my money.
Our needs will be the important thing to us. We can not just use the money for gambling and expect to win much money. It will be difficult to get it.