The only reason why I'm in support of this is because the stake is actually moderate, this is what it means to gamble responsibly and smartly. $20 to get $700 seems like a lot but it's possible but what makes it safe is the amount, some bettors prefer to chase small wins with huge stakes and to me that's way too risky because even small odds are not a guarantee of winning, make sure you always stake a moderate amount
I don't understand why gamblers are so fond of setting themselves such huge distant financial goals that are very unlikely to be achieved.
It's just that if I even take into account the roulette chances, which are 50/50, then there are two possible outcomes: either losing those 20 dollars, or doubling them. And the positive outcome is 50 percent. The next multiplication by two implies 25, and so on. And the chance of accumulating $700 this way is very small.