If you bet $100, your odds of winning are around 50% and if you lose, bet $200, and so on and so forth until you win, and then cash out with a guaranteed profit. Assuming odds of black are 47.37% as per American roulette, your odds of not winning a single one after 6 tries are 0.02125 (I think) and decrease exponentially after each subsequent try.
In: 93
98% of the time win $100, 2% lose $6300. Looking at it that way, you see why it’s a bad idea – you’re unlikely to lose that many times but if you do you lose a huge amount, and it’s still a losing game overall.
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