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It could be the situation that he still lives with his parents and saves little by little. But I think if depositing as much as 20% of his savings just to enjoy gambling, I don't think it's wise because he can forget to control how much he spends.
A total of 20% of the savings is for one-time use or several times playing gambling would not be recommended to use that amount for gambling.
The percentage is calculated this way: If you earn $100 per day, then spending $20 per day on gambling means you spend 20% on gambling. If you spend $20 per
week, that's not 20% of your earnings/savings. That's around 3% which is acceptable.
That's a huge part of savings for someone supporting their family, but the word "savings" is what caught my attention here, see, not "earnings", but "savings". I think it means the guy is living with his parents, saving little by little from what he's getting for small expenses. I may be wrong of course, but then the guy should probably reconsider his budgeting. Spending 20% on gambling is unacceptably a lot.
For me, 20 percent isn't that much ~
Let us say my weekly savings is around 50$ so that makes $10 an allocation for gambling. In a month's time, I would have $200 savings and $40 of those would be allocated to gambling. $40 a month for gambling is a small amount in my opinion. Other players gamble more than that in a week.
If by "savings" you mean the money allocated for entertainment, I agree with you, 20% isn't that much. But that's only if we are talking about spare money.