Hence a good strategy is use martingale and stop while you are ahead.
It is possible, although slim to lose out in the short run, there is still a small risk to bust.
Exactly.
And after you stop with a little bit profit today, you would likely come back tomorrow and repeat the process again and again to get some "
easy profit"...
It is unlikely to encounter a long losing streak if you just play a handful of bets. But if you keep betting again and again, the chance will become larger and larger...