Gamblers who have a good mindsets can go and step out without hurting too much of their money, those who are careful and not being too emotional attach to gambling have a good views and able to stop once they are already satisfied either they win some or lose the point of getting the entertainment is the one that they are focus. Always make sure that you are in this kind of thinking and you always have good control of yourself when gambling to avoid bankruptcy.
You are right. Often gamblers lose control because their predictions are defeated by the system. This often makes people emotional and out of control. You know what the ending is like. They will definitely make more deposits with the aim to avenge their losses. And they play emotionally, it's like standing on the edge of a cliff.