Different person will define winning in different goals.
One can say they won if they have completely stop gambling.
One can say they won if they able to control themselves and being responsible during gambling.
Winning isn't everything about profit, but it could be achieve the biggest thing or you simply master it when the average are fall to addiction.
I agree with you, there is an article or a video or something that explain the interview with an old Las Vegas casinos player was once asked, what is the best way to profit in a casino games, he respond was quite outrageous and abstract. He said " To profit greatly from casino in Las Vegas is to get the ability to find the nearest exit from the casino hall"
That if getting through that exit door is always easier for you, then you've won greatly.