Which means if someone wants to play just because they want to earn something like grow their bankroll, then they should really know what they are doing, what strategy they are going to do,
Just to add a little, even though the person has a good strategy, the results in the field cannot be predicted easily, all of that has been arranged by the host who issues victory or defeat to a gambler. If there are still gamblers who have a strong belief that by playing gambling they can produce or add a lot of money, then that belief is a big mistake for them later and the result is that the gambler will actually lose a lot of money rather than get money at the casino.