For me, every player always expects to win, the house advantage is known and the player still accepts the conditions, so how do windows of opportunities to win open in a casino? They only focus on that, when a player wins and not when he loses or the amount of money he loses, the casino will always have the advantage and there is nothing to do here, people think that since it is a game with probability fairness they will have more chances of winning and it is not like that.
I think many users have already explained this in the aspect of the whole concept of these casino being a business and in every business you actually don't expect the owner to be at lost because that's exactly how I see it though, many gamblers should get the fact that it's a business and if they get to win all the time by having the upper hand then the gambling industry won't last long so as gambler having the mindset of the casino have the upper hand would help accept results and outcome of your gambling sessions.