Not all people will stop gambling when they lose all of their bankroll money. Some people prefer stopping gambling when they see some losses and don't want to lose all of their money in a day.
No need to lose all money in gambling especially if they can treat gambling well.
It only means you can’t afford to lose your bankroll if you already feel the urge to stop gambling right after experiencing some lose bet.
You probably have a certain amount threshold for your risk appetite that’s why you will stop mid way. Since there’s no sense on depositing that whole amount if you are not willing to risk it all on gambling.
You will just increasing the deposit wagering requirements if you will deposit an amount that you didn’t want to risk it all.