The way gambling works is that those offering the games don't pay out fair odds when you win. This is called a house edge and no betting strategies can beat it. So yes, you will fail.
Not true, martingale can work very well in theory, if you have almost unlimited amounts of money, this way the changes of losing are ludicrously low.
"Almost unlimited amounts of money" will still prove it to be a fail. The premise of "not getting fair odds" has not changed. The risk of finding a busting sequence will always be greater than the reward you are targeting in a -EV game.