In this particular example if ever the bonus given is $200, then the WR seem $4,000. Grand Martingale opens doors to more losses dependant on players' luck, where he doubles the bet and adds another unit when of a loss. That said, we can say that good losers are realistic families. https://hocvienboardgame.net/tin-tuc/choi-lo-de-tai-rikvip-trai-nghiem-thu-vi/