If someone gambles, it's already attached that losing is always be one of the results. Well, there's not that much result but only two exists, to win and to lose.
But most of the results that would happen to us is losing, this happens very often whether you're good and discipline. It's inevitable and whether it's your fate, you must come up with a plan and I agree with what you've said about knowing when you should stop. Whether you win a lot or lose a lot, you should know how to stop.
It is not about most results being losing. If you gamble on a 50% chance game that means you will win 50% of the time and lose 50% of the time, and on a long enough period of time it will reach there and stay there and you will not end up losing more than you win.
However the reward payments are if you wager 100 bucks, you win 99 bucks when you win and you lose 100 bucks when you lose, that 1 dollar difference is called the house edge and that is why people do not gamble and win, not in the long run.
House edge makes sure that the regular odds of what should happen in the long run helps the casino to profit and that is why there is a low chance that you will make some money on gambling. Obviously anyone can get lucky and win a huge amount, I can go to any website, bet on the lowest chance to win, usually 9999x in many places, and win that if I am lucky, but that doesn't change the fact that in the long run I will lose that too.