I guess that you cannot always win with your martingale strategy because of it still difficult to get this strategies works in a long time no matter you can master the strategies. maybe martingale is work in the short time only and for a long time, I think you need to make another strategy so you can still win in the game. I hope that you can control yourself and not spend too much money if you decide to play in all day long.
Martingale will work if :
1. We have an unlimited balance
2. The casino has no max profit rule, means we can bet with whatever amount we want.
And I guess, those two conditions will be impossible to achieve and that is why I considered martingale isn't the perfect strategy in gambling. It can work if we are lucky enough and know how to stop, otherwise it will fail.
Otherwise, it is not possible for everyone to win bets with the help of this strategy. I highly support your both conditions and everyone knows none of them is possible. So basically, if someone wins a good amount with martingale then definitely it was his luck. Ultimately, gambling is a game of luck and pure luck only. Random games cannot be won by any strategy.