It all depends which casino you play in and how you gamble. With a good strategy you will see that you will managed to keep your winnings postive.
With a excellent strategy and a reliable casino you can win a lot and thus make profit with gambling.
As long as you gambling with the intention of making a profit from gambling, then it is not worth to gamble because as we all know that in the long run, only house can win and gambler will lose. Even you play with superb strategy but it will not last forever, and one day you will lose back money to the gambling house. If you play gambling with the intention of fun and entertainment then it is worth.