$50 a week is not an allocation. You should maintain this leave because it is $200 a month which in some countries can last a family for a month. When you start using more than this amount of money it can make you financially weak. Gambling is very attractive so a person can get addicted to gambling very quickly. And if you get addicted to it then no matter how much profit you make you will not be happy and you will expect something big from it. And gradually you will keep increasing the gambling which will not only harm you financially but also torture you mentally. So your fixed budget should never be more than $50 a week
Money management and discipline are very important for any gambler, but I believe there is no specific amount a person should spend on gambling each week. It’s all individual, because for some people, $50 may represent a quarter of their monthly income, while for others, it might be just a tiny fraction of a percent.
It might be good if they have set amount which they can able to spend since somehow there's certain reminders on alerts them that there's certain amount that they can afford to spend once they are in their session.
Since if people doesn't have amount to spend in mind there's a chance that they deposit more since they might they that they are fine and could still afford to lose the money they deposit. To bad if they reach until everything is gone and they became uncontrolled. That's why they need to manage well their finances and spend the amount they can afford to let go. We provably know how much we could able to spend especially if we are done paying all necessary things and what left to us or maybe small percentage of it is good to use for gambling.