Indeed, such greed is built in inside us without that proper control we will just ending up losing more instead of taking some and enjoy, we should have that capabilities to limit ourselves and take time to stop when it's needed the most, gambler who have that kind of control always have an edge against those who doesn't have and also have that capabilities to take advantage not only with the fun and excitement but also the chance to make some money from the casino, though not all have that but it's needed if you want to enjoy and not to fall into any types of addictions.
Which most of the time gambler keep repeating aside from losing they also get that deep engagements that mostly ended up getting addicted and lose more money.
Greed is definitely there, not even just in gambling, in other things in everyday life there must be people who are greedy, especially when it involves profit. Surely everyone wants more when they get a profit. But naturally, because money is the thing that everyone wants, because with money we can buy everything, but not everything can be bought with money. I agree with you, we must realize that gambling is not a means of making money, the victory that has been obtained once is likely not to be obtained again even if we continue the game, from here we must be able to have discipline and also limits in gambling, if it is not ready to lose the victory that has been obtained then it is better to think again if you want to continue gambling to get another victory.
A common mistake in my opinion is that they think gambling is a means of being able to make money. So that many of them experience losing a lot of money just to get a big win according to what their hearts desire. But with their assumptions like that on gambling will only make them addicted to gambling and experience losing even more money.