When I'm still unaware of this, I'd believe that martingale works but the fact is it doesn't really work. To those folks out there that still believe with this strategy, wake up and don't spread a strategy that really don't work for most unless you want to see misfortune of others.
The thing is there really isn't any "strategy" If there is then there will be people who will win almost everytime when they gamble. People just want to believe in something so that they can enjoy more and have a positive view on what they are doing. It's in human nature. They tell theirselves what to believe so that they can ignore the fact that gambling is a way to loose money.
There are some strategies that will work in some games, probably one of the most known strategies when it comes to a gambling game is counting cards in blackjack, however people have the completely mistaken idea that having a winning strategy means that you are going to win every single time in a casino and that is simply not true, a winning strategy means that you have an advantage over the house under very specific circumstances.
But even then you cannot go crazy and bet all your money every time because you are going to lose it very fast, and it is my opinion that this is by far one of the biggest reasons of why people fail even when they have an advantage, because even when they have an advantage they decide to risk too much capital in each bet.