As said, this isn't the reality for everyone. If a rich person tries this way, it is different because the time and money spent won't affect his personal life. For a common man, each and every dollar risked is something very important, and that could help with fulfilling other needs. Many of us do this, we just gamble and lose everything. If we hadn't gambled and lost that money, we could've gotten better or experienced upliftment in life.
Yup, this is not for everyone because we have a different level of life, some of us struggling on how to get some money for gambling activities and some of us are not experiencing some problems because they can sustain their needs especially money. It's kinda difficult for other people to distinguish if they can control theirself or not, so it's better to advice that we need to assess ourself first so we can mitigate the problems that we are possibly facing once we gamble.
The best way to control your bankroll is to quit the game when you are running at loss, and don't think of recovering your losses because it will lead to more loss.