^
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.
Gambling addiction is not something you can see just based on the amount spent in gambling. You give an example of spending no more than $100 a month, what do you think if the one who spend that amount has no stable monthly income or have stable income but less than $100 or even less than $150? That's an addiction for me, because the gambler is not able to manage his money wisely based on his own income.