Sadly, most players believe they can decide the given game when all along, they are merely obeying their brain to win every time. The misperception of better thing to come make many to lose control. Understand that house always has better hand and that winning big is illusion and actually may destroy your own personal financial status.
Yes, this desire to want to win is what makes gambling continue even though the results that occur are successive defeats, this is because of a strong urge that cannot be ruled out, moreover those like this put great hopes in gambling so it is difficult to stop so that it makes players unable to control themselves or as you say lose self-control.
With the actual victory it is real, but we must be able to limit ourselves not to pursue it because when we pursue it here is where the destruction begins to occur.