Let say for gambler's who have alot of free time to gamble but have limited cash flow and decide to bet with just little amount to stay on for a long time, may fine this advice a twisting head for him since it will be opposite of what his believe is and how he managed his bankroll all the while.
Secondly bankroll management is very important to both those who gamble for the fun and those that choose gambling as means to make some profits, so regardless what your position is one indeed need a workable bank roll remain above waters while gambling.
Interesting question mate, I think you have first understand the concept of bankroll management and the first step setting a budget,
Setting a budget doesn't have to be big funds it could also be small and affordable funds, it's just bring out a specific amount if cash for gambling for a given period of time, let's say I earn up to 20000(speaking in my local careers so yeah it's quite lower in value to dollar) and I an decide to give only 1000 to gambling as my budget or even 5000 as my budget,
Then the next step is to determine how much from that budget would be your stake ratio, you could decide to stake only 10 per game or 100 per game it's your choice and I think this should be relatable to the amount you have at hand.
So if you understand this you would know that bankroll management doesn't really demand you to have huge income, its just a way to gamble right and not giving out more than you should and at same time staking smartly.
All these are good rules to read and hear about.
But does a gambler really care reading advice from others? They started gambling in the first place to make big money and they are unable to achieve it - and the machine to make that money is right in front of them, hence they will never think about bankroll management but only how to acquire more money to wager, be it taking a loan, stealing money or worse.
Hence the wording "maximize winning potential" is wrong. If you want to win maximally, you need to stop betting completely, suck up the losses and move on.
Your right, I also found out that people that tend to gamble in local casino or bet shops have little luck with applying bankroll management cause they have more tendencies to be more aggressive gamblers than most, but this strategy works best for those that gamble privately and want to utilize gambling as a source to get some additional money and not as a life changing money or getting greedy about it, worse of all is that people that are most greedy in gambling never get rich off it, it makes them poorer cause they would of wind up making bad decisions over and over again.