When someone doesn't want to listen other people's advice, especially advise to playing gambling, they will not have to stops their habits in gambling. They will gets deeper in the gambling and will not realizes that they are already too far and needs to reduce it before something bad happens to them. That can change his behavioral and will only thinks about himself and not want to do anything else because he use gambling for a main things for his lives. That's a sign for someone that already playing gambling too often. They will not see something happen to them even if they gets suggestion from other people to reduce their gambling activity.
That's right, if gamblers don't want to listen to good advice, just let them be because gamblers will feel the good and bad. We already have good attention so that he doesn't gamble excessively and also don't let him experience big risks in gambling, but our attention is simply ignored and the gambler continues his wrong behavior.
The majority of gamblers who find it difficult to listen to other people's advice fall into the category of addicted gamblers.