Personally, I believe that if a person spends no more than $100 a month on gambling is the first sign that he does not have a gambling addiction and is quite able to control their budget. It happens that I spend $200 on gambling but I always split this amount into two different deposits and do not allow myself to spend more than $100 per day.
I think that is way too much unless your monthly income is $10k+.
You shouldn't allocate more than 5% of your income to gambling. You should treat it as an expense because you are mathematically guaranteed to lose it all given that you play with the funds for long enough.
Would you spend $200 a month on movie tickets?
Probably not.
Have the right mindset.