My allowance for gambling losses is determined by a fixed amount in dolars at the beginning of n each month.
This amount can be high or lower... depending on my houses expense obligations (healthcare, market, electricity, bills, etc.). After I calc this amount I make the cassino apport, and now know that this is all I have until the next month.... This is my maximum amount that I can spend.

From there I develop my risk management. I place bets based on my desired earnings, my perceived profit margin and the current odds, always keeping one thing in mind: If I deplete my bankroll prematurely, I'll have to stop betting until next month.

This is good for me because I prioritize the money I can't afford to lose over greed and the desire to make a profit.
Obviously.... I can ends the month with more money than I entered, in which case I decide whether to withdraw or if I will have a "betting bonus" for the following month.