We abandon His provision and rely on and live in hope of random chance for security. People are trading a sure relationship for the temporary thrill of spending on that, which cannot satisfy eternally. Either we trust and serve God wholeheartedly without reservation, or we don't. Either our security comes from recognizing that we are children of God, relying on our Heavenly Father or we are deceived and our loyalty is to false gods. Those who choose to gamble give God a loud and clear signal that they are dissatisfied with their lot in life.
People worship the big strike.
They seek the 'rush' which gambling provides. The Israelites wandering in the desert also complained that their life was insufficient. Both of these situations displease God. We are already wealthy through our relationship with God. By no means, for God supplies all of our needs through Christ Jesus.