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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.
It's funny how we compared gambling on watching movie, I mean the money we spend on watching movie is not a "spare" one, because we intentionally saved it just to watch the movie we wanted, and that's what we called "leisure" or "wants" in other terms, while playing gambling is also a "want" but I just disagree that it's like watching movie, well I guess it depends on a person.
Nonetheless, it is true that we must only use spare money in gambling to keep ourselves out of addiction and problem in the future.