After all types of spending 1% of the rest might be too low for majority of the people. If anyone can warn 1000$ in a month and spend 500$ as monthly expenses then 1% will be only 5$. Don't you think it is too low budgeting for gambling. I think anyone can bet any amount which the person can afford if loses.
If someone is earning $1000 and the person is using $500 on the monthly expenses, that means the person will spend $10 monthly on gambling. The 1% is not calculated from the remaining amount but from the whole amount that the person earned for that period of time. But if the person does not have any savings left or struggling, the person does not need to gamble at all.
Yes, people should gamble with the amount of money that they can afford to lose, but my post is about the recommended amount that a gambler should spend on gambling which will not at all make gambling have any negative effects on the person.