While they still have the money and winning, they are still on the cloud 9 and probably forget about the reality that gambling can make you happy once but can make your life worst many times.

They tend to gamble that much without any plan or limitation and the result is very bad, this is the only time for them to realize that they are not doing good and they started  to seek help which I believe its not too late for them to change. Addiction choses no one, gamblers are more prone to this so if you are going to gamble make sure you are responsible and know when to stop.