i dont use any strategies and i believe that no one should do it as they will loose in a longer run does not matter with a strategy or not
But in my opinion strategy is still needed to bet on dice although there is no strategies working for long term. Without strategy means that you play blindly, I would say it is a dumb gambling.
Yes, with a strategy you can earn good amount of BTC. If you have a good strategy it's profitable, I made profit myself with my strategy

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Strategy is needed in gambling, but it's not just for pure-luck based game only like martiangel. It also about how to maintain your bankroll (bankroll management) and know when to stop for that day.