~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.