Every person has their own capabilities when it comes to make the bets. Some may put bigger amounts cuz they are rich enough while others will play smaller amounts. They who put big amounts for sure have the big chances to collect good profits in no time and vice versa. But the risk is also there. Playing big amounts means taking the big risk as well. They can lose a lot too in no time.
As long as they can accept the risk of losing the money, they are free to use any amounts to gamble because that is their money and they must have a responsibility to their money.
Those who put big amounts know the risk and win big money if they are lucky enough to win the games.
But if someone uses big money but can not accept the risk of losing it, they are not right to use it instead, just use small money to gamble.
That is why when you gamble, you need to use the money that you can afford.