but given enough time the casinos always have the advantage or they would not be in business.
Depends what type of the "casinos" you are talking about. If you mean roulette and dice - sure, they will have a guaranteed edge in the longterm. The only thing they need to worry about is having large enough bankroll to survive the short term variance and a good enough security to avoid hacks.
Poker rooms - those are taking rake, they do not care if you are winner or a loser. They are just arranging the game between players and take their cut.
Sport books - those are actually go out of business a lot, often running away with people's funds because they could not take the losses.
convincing yourself that you are better than the next guy at gambling and you won't lose is also a defense mechanism.
Thats true, but its not what i am doing. I am simply aware of my edge and my expected return over the long run. I am fully aware of the variance and the swings, and i am well prepared for them. I also know how to work on my game and how many hours of that work to put weekly, to make sure that i will continue keeping that edge.
and even if they win or loose they dont need to care about it... ohh i wish to be one of them 
