We can never beat the house, no one! The luck is very rare in gambling, even you are winning in the beginning you will never know if it will continue until the end (I doubt having an ending). Don't be greedy on your winnings because it will not help you, it will cause you losing your earnings and leave it with nothing.
It is true, when we have profits, we had better withdraw, don't play any more. Or we would lose all the money eventually.