Well it can be very profitable if you made a lot of profit from it. If you make like a million form gambling it will be profitable on a long term.
But you shouldn't make gambling main source of income. Because gambling is not stable enough to do that.
Which is highly unlikely. No one profit as big as that, except those lucky one and those big time gamblers. Ordinary gamblers are the most addicted one even if they win only dust and lost too much in it.
All I can say is it's not profitable in the long run. No one profits from it except the owner.