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.
If you calculate how much some of us have spent on gambling since we started playing this game, it might not get to $50000. I might not be able to accurately calculate how much I have lost in gambling but I don't think it has gotten to the stated amount. There are some gamblers who have won millions of dollars from betting. We can conclude that such a gambler has beaten the house.
To say that you have won the casino it means that you either have a system that can always put you in profit or you win a huge amount of money and stop playing for a while to avoid losing or better still stop playing permanently to avoid losing later on. These are the only ways you can boldly say that you have won the casino. As long as you are a constant player it's going to be difficult to actually win
Is it possible to have a reliable system that brings constant profit in gambling? Maybe investing big wins in an asset's profitable venture might be a good way to be in profit. It is common to see gamblers putting in all they have won on gambling and sometimes losing it all.