Martingale works in the beginning; I have used it quite some times on various times and always got away with it. Offcourse, it will go bad one day and that happened already to me 2 times so I quit doing it. It is such an easy strategy and sometimes I still think of using it, but most of the times I can hold myself from doing it.
Exactly. Many people criticise it since it's a negative progression risky strategy which is totally understandable, but the fact is that it's the most popular gambling strategy out there since it's so easy to use.
I know people(Including me) who earned decent amounts using it by playing smartly in the short-term. High risk, high reward basically!