I once got up to 23 reds on martingale... Lost quite some money there lol.
Maybe, you should only martingale if you have the bankroll. I have seen players who martingales with base bet of few sats, and were betting 5 btc as their last bet. If you keep around 25 losses in mind, you should be fine with martingaling(for a short term)
Martingle is a great system if you have unlimited money. Please see why does the casino has the max bet limit?
But my best strategy ever is never stop playing when you are on winning streak and stop playing when is on losing streak.
I made a little money with it.
If you stop on a losing streak you are not doing martingale.
Also, if you have unlimited money you don't need to go to the casino.
Then no one can martingale in real life, because you can't double your bet forever.
That's why it is a bad idea. You will eventually hit themwx bet or go broke.
The min bet on online casinos is like 1/100 cent, and even doubling up that, you could come up to like 400$. In casinos, min is around 1-5$, so its even harder.