Self management and self discipline matters a lot for a man with his family, so that he can use his cash inflow properly by assigning only little amount of his monthly income on gamble. This is why as a family man, you need to put your family first before your own personal expenses to avoid problems.
Gambling should be done with caution to avoid overdoing it, so that it does not have side effect on you and your family, which will lead to divorce because of addiction. One should only use the amount of money that he can afford to lose, so that it will not affect him emotionally, to the extend of using all the money in the house for gambling because he is busy chasing his losses.
Initially, you need to think not about how much you can lose, but how much you can earn, this is a psychological moment that already shows the player where he needs to strive. Although I agree that most players will lose more than they win, and for such, of course, limits need to be set so that they do not lose more, than they can afford, so that this is within reason.