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.
The most important thing is to make sure that you manage your risks...I'm saying this because as long as you are a constant gambler the chances of being in profit at the long run is low, that's why you should always take advantage of the profits you make and cut down your stakes, these are systems that can maximize profits and minimize losses..if this isn't done the casino would always have the upper hand