Gambling starts to be a burden from the player once he uses his money for his bills or other necessary expenses. But if it is just extra, you won't be so much agitated for what you will spend in your games.
But many gamblers are doing this, spending their money meant for bills just to play. They will have a high expectation to win, believing it's possible to double the money in snap. We know it can happen but risky, since majority of gamblers are just losing their money in gambling rather than gaining. The reason why it's best to only gamble using a spare money, to minimize the impact if ever the gambler didn't win.