Yes, limit the amount played in the casino to overcome not going bankrupt, because there have been many cases where they did not control the budget for gambling and ended up losing everything.
Just 5% of the total income is more than enough because the purpose of playing in the casino is only for fun not profit.
But somehow until now there are still many people hoping to win a big jackpot from a small budget.
Well things are always very good to consider them with percentages, depending on the type of work you have and the income you are going to acquire you can say or talk about a % to assign, normally it is what sounds more logical, however in my very particular Economy I would only assign that small amount of money when it comes out of all my Expenses , including children's schools, taxes and basic things for the home, if there is enough or something left over it can be used for it, but normally there is not enough left over but what is needed.