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Responsible gambling I think means that we must only gamble what we have spare and aren't too worried of losing it. People spend money on movies don't regret watching it right? Similarly people gambling should not regret losing it.
Spending on watching movies is a perfect comparison, imo, I'm using it too. Take the ticket price. This is exactly what one can easily afford to lose in a week/month of gambling, depending on how often they buy movie tickets. For some people(and I was one of them many times) even once per month is too expensive. Such people to be responsible gamblers should spend on gambling accordingly: less than $10 per month.
If you have that Mind set then you are good at it mate because it is not easy to allocate small amount for gambling each time since it is addicting and really wanna stay playing for long time .
and also compare how much we can spend in watching movies with popcorn and softdrinks than spending in our gambling moment?
10-100$ per weekend? when in gambling we can just lose that ina couple of minute .