There is no such thing as winning more and losing less in gambling and if we say successful gambler what do we really mean, those who won a lot, those are happy and enjoying it even losing or those who manage to minimize their loses? In short, those who can control their loses. Gambling in my opinion is not really meant for source of profit but only for recreation so when one is playing, he better not take it seriously and put all his money in but control himself and his spending/betting.