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That should be the basic motto in gambling. Gamble when you have extra. And not because you want to find extra funds. Because most gamblers have the mindset that gambling can either give him the jackpot or will give him the huge profit that he's aiming for. However, we all know the end result of most of our games.
Though some are playing for fun, but we all know they also have hidden desires of winning. And they are like occasional gamblers that would only play using spare funds, hence, they can easily say that they are indeed responsible gamblers. But for most, quite hard to be responsible as they can't contain themselves in front of their games.
Nowadays a huge percentage of those gambling don't gamble due to having extra cash in hand but to rather make extra making them lose the funds they could have had other plans for. That wrong mindset of doubling funds through gambling have made many gamblers run huge loss to their funds leading to a loss chase with a bad end.
It's even better to play for fun and give the least expectations to making of profit rather than putting all your thoughts on making money from how you gambling. It's easier to stay responsible that way than dealing with the money making mindset.