Most people here have experience on using martingale because they already know the effect and results when you do use it. Martingale does work on the first time sometimes and you could able to gain profits with it but when greediness of yours comes you would surely get busted on the long run.
never work in the long run , you might receive a good winning in short period.
but once you do it continuously , the house edge always take your money away.
It's not the house edge, but you'll reach an impossible amount in just a few beers by starting even with $1. Doubling down your amount every bet is TOO risky and cannot earn you much profit. If you lose, you're down a lot.