If someone win huge amount of money like $50000 with just $200, that person has won the casino. Some people are risking small amount of money but won huge amount of money, such person can win the casino. But just that as some people are trying their luck, they are losing and the casinos are still the one winning overall and making much profit from people, but there are exceptional cases that someone won huge and use the money to start a business.
Is this so? I have my doubts because this amount of money the gambler won can be his last on the casino, he can keep risking let's say $200 every week on gambling and keep losing the money or winning back $100-$150 until he save back the whole money to the casino pocket.
Also, what is your business with gambling after winning 50,000? The only way to really win the casino is to never gamble again, because that money stands as a debt that needs to be paid, whenever you are back to gambling there is a high chance that you will pay.
The best way to win the casino is win in a single strike and never come back again, go away and enjoy your money, find something else to do as source of having fun and killing time.