This will definitely be a problem for him, not only in gambling but in real life. When he has to face dark times with little earnings and a lot of expenses, how will he do if he doesn't know how to manage money properly? He will get into debt and this will lead him to a self-destructive spiral.
That's what often happens to gamblers with small incomes. They take too big a risk to gamble. Of course, they don't have bankroll management and just enjoy the game to get lucky. If not controlled, then everything can be lost.
All is different from rich gamblers who do have good financial management. They know the limits of the risks they can take. Although it is possible that those who have a lot of money will also bet impulsively.
Their low income and lack of experience in gambling can tempt them to take high risks. They have low income, they consider gambling as a way to earn money and meet their daily needs. Their inexperience they risk losing money in the beginning and they can gain a lot of experience from gambling by losing money and reduce the amount of losses in the later periods.
The difference in money management gives rich gamblers a distinct advantage. Their management and bankroll system prevent them from losing excessive amounts of money, the amount they lose was allocated for their entertainment.