If you walk into a casino with $200 and you start playing with that $200 and you win $200, get the hell out, you simply just doubled your money, take your goddamn leave, what do you think you wanna do? Win a million dollars? You will go home empty handed.
This is easy for someone to say but if you ever do that for real, you will not be able to do that, the serotonin that you get when you win is going to make you decide differently and make you want to stay gambling even more because your brain if not discipline will make you think that your luck might not be running out yet so you push it even more until you lost all the money that you have, I dare you to try it for real and see if you can do it after a win.
The next thing that rings in your ear is you can still win another or more, that's the devil whipsering, the art of gambling is knowing when to stop.
That is not the devil whispering, that is just your mind and you only trying to justify playing another game and yes I do agree that when this feeling of whispers is starting to accumulate, it is a good time to stop but then again this will be based on your will and discipline again. If you can resist playing more games then good for you.
The only game where you have some power is in Poker, not the online one, this is the best game in casinos, as making profits off of bad players is possible.
As for Other games, You are at the mercy of the house.
Blackjack has the lowest house edge so technically, it is not just poker that you have some power or control. But it can be argued that if you are doing good in Blackjack, you might raise some eyebrows in the casino as Blackjack is notorious game for card counters which is not exactly illegal but it is definitely frowned upon by the casino.
No one actually visits the casino to have fun, you gotta trick the mind, I like to think of it has a fun night out and I am going to spend a few hundred dollars and have a good time and if I win it's a bonus, like I've said, you gotta trick the mind.
Always remember this, you are there to win a game where its statistically impossible to win at, it's not impossible to not understand this about gambling, a wise man once said, "if you want to make money with gambling, own a casino".
I am at a loss here, you are not most people that say that casino is for fun including me, I do not think that people that think like that is going to be good for casinos because playing for money will inevitably lead you to the path where you will try to chase losses.