Using math you can also prove that some strategies are actually slightly better than others and can in fact even get a bit more house edge percentage in your favor, talking about a pretty small percentage. I believe one sequence of martingale gives you better odds than 1 single bet. For example if you have 1 BTC, it's better to split it in a few smaller amounts and bet using martingale, I don't remember exactly how you had to split it in order to have a better chance.