I've learned that in a hard way. I lost all my earnings. I had profit from playing smartly and found a strategy that looks promising. Probably, it's like stumbling in gold. When I tripled my bankroll, I thought, it won't hurt to get a dollar more or so. I lost everything. It's true that you will lose in the long run, no matter what your strategy is. Or maybe i'm just unlucky
You had profit and some luck there and then decided to push past your own strategy anyway. Thats just naturally what happens to those who win, hubris brings them past a safe point and the casino gets back their winnings. The way to profit is to suddenly flip when you have your earnings, whatever strategy you have that works and you have the profit then this is when you depart the train and walk away richer. The strategy is only good if you can keep to it and then keep away from it and just take away the money.
The bad gambler does the opposite, he is the master not the strategy and he is basing his decisions on his idea at that moment. So they get the winnings but look to up the stakes even more instead accepting you must lose it if you keep continuing in risk. Simple answer is most are not disciplined enough to follow a guide never mind a complete strategy and hand over control to a long game plan