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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 believe it is the other way around. First of all, the fact that someone is planning their gambling expenses is good. The problem arises when someone is unable to refrain from gambling, even when his budget has long been exceeded. Of course, each situation is different, because someone could for example won a larger amount before and now he can easily lose it, etc. Anyway, sticking to the budget is the most important thing to avoid troubles.