Actually we do not need an excuse to stop gambling. Gambling is not a very good thing to always do, but as long as we can control ourselves during gambling, we can get away from bad things. But the decision to stop gambling is a decision that must be respected without having to question why.
Gambling is not a good habit to make, people may find it relaxing and amusing to play gambling whenever they are sad or lonely and just want to have fun but it may consume people. What I mean by consume is that many gamblers have already been addicted and it does not bring any good to them. It just brought them problems and mental disease where most of them became dangerous person.
If someone, whom gambling is not being helpful, decided to leave it for good then I would very happy for him. Though it is fun but is bringing more problems in your life then it is just right for that person to quit on gambling.