Many people use martingale strategy in dice games, and chance to lose there is 0.1% Or even less, depends on what bet gambler makes every roll. And point is, that people lose even with chance as low as that, so i'm not surprised at all that people can lose with 8% chance. If they think there are some kind of strategy they just should bet all of their bitcoins on 50/50 and they will see they won or not, this way they will save time