~snip~
Yup, nothing but the discipline that you will go to implement whatever strategy you are planning to use while playing,
both flat and martingale strategy have good potential outcome if you can stop at the right time.
It's more on your self-control, both winning or losing. You should have set the limitation that you will use to make sure that you will not be overstaying inside the house.
If you can do that, the chance is good for you to earn some decent amount out from your gambling.
Basically if you want to not lose money gambling you need to either never gamble, or stop gambling once you have won more than what you have gambled so far.
The problem is that the expected return is negative so most of the time you will continue going down until you lose it all.
If someone is into gambling then he/she has to gamble somehow and if they lose money with the gambling activity then that's their own luck which didn't favored them. It's always better to stop betting when you already won enough bets and be happy with your winnings. But, unfortunately there are some gamblers who even winning many bets still continue gambling activity and as a result they will lose everything.
I have previous followed a thread where a gamblers successfully turned $4000 to $90000 with gambling, and in greed the gambler made another bet and lost the money. If he had withdrawn half of the money then he could enjoy for many years without any issues. That's a lesson one should learn because in gambling you either win or lose and if you put everything as a bet then you have higher chances of losing.