When you have a fairly good victory, at the moment you have it and enjoy it, and you have to go to the casino again, you have to go with a moderate attitude, I think that you cannot arrive with an always winning attitude because just as you had the good luck to win, you can also have the bad luck to lose, and if you don't control it you can have very large losses, the best thing for that not to happen is that you have to have a large amount of money that you have to lose, you cannot have a lot of money to play because if you lose there will be no more funds or to go back, that is having some responsibility.
Even the thought about it make me scary - I one lost my 6 months saving and that was the most toughest time of my life. Now I don't gamble.
Well, I rarely make big wins, most of the time I either loose a bit or win a bit. However there was once a game here in the forum about guessing the value of bitcoin at a certain date. Some legendary member offered something around 2000 (at that time) and I happened to be the one guessing (and it was difficult believe me, there were lots of people). So I guess that was my "big" win.
most of us does 
Gambling is a place where we are all supposed to be a loser , but at least we enjoyed the game .