Where is this coming from? You are wrong actually.

Bankroll management is very important in your risk and money management, it's the way you actually manage your finances in gambling. If you don't manage it well, you will be ruined financially because gambling itself has the spirit that pushes people into doing more, and this is regardless of whether you are addicted or not, it gets clear only when you have made the mistake, that's when you start regretting.