To many people discuss about Martingale strategy since they really find this interesting but as said people have different level of patience that's why we see people execute this strategy differently that's why each of us got distinct results.
Martingale requires minimum 2 or higher odds to execute properly along with high limits. Duel arena satisfies the first condition, but doesn't satisfy the second since it's not easy to find players willing to bet huge amounts.
Many gamblers try to execute it in various games in different gambling sites and fail because the odds aren't exactly 2 thanks to the house edge.