You have an army of soldiers (Your money)
The casino has stronger soldiers that can easily kill yours. The casino has unlimited amounts of killer soldiers that keep respawning until you are defeated.
Ultimately you send your soldiers to battle in a hope that you defeat more than you send out. But, the soldiers you are competing against have way better guns and experience.
Gambling becomes a problem because rather than surrendering, you endure the battle head on and create a problem that wasn’t there before.
Accept defeat and move on.