Dont waste up that money for a short period of time yet martingale can bust you out on a blink of an eye when losing streaks do hits you. This would matter on luck and for those friends of yours do make use of this method might be lucky on that day but as we all know not all the times we are lucky. It can turn upside down and take those winnings from you. Use for your own risk and dont expect too much because roulette and dice martingale strategy has no difference at all. Just others said this had been discussed for how many  years already.