Unlike most people here, I believe bankroll management is a strategy that gamblers can apply to better control their gambling. Gambling strategy isn't just about choosing games or relying solely on luck, but also about managing your money so you don't lose it all at once and can continue playing for longer periods.
It is never possible to win by using only winning and losing strategies in gambling. The gambler must acquire good money management skills. Sometimes money management can enable a gambler to survive in gambling. Moreover, if the gambler acquires good skills in money management, he can also reduce his risk in gambling. When a gambler is addicted, there is no money management step in him, which is why the gambler quickly loses all his money and becomes desperate.