Are those numbers for real, because I am surprised that somebody has actually won those huge amount which is actually an insane. Because I am sure it had an huge wager to win those amounts and not surely only a millionaire guy could dare to wager that big and luckily ends up winning it.
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In reality, your appreciation is very valid but the betting ecosystem no is still different from life itself, that is, there is extravagance!!

One way to begin to see that such bets make sense and are real is the limits on the maximum that can be bet per game, this varies from one casino to another, but knowing that amount you can understand that even casinos protect themselves from this type of players.

Another way is to see live allbets or big winners of the day, week, month, they are there betting big.