As long as you know how to play it and generate good results which makes you profitable then that is smart.
Let me get this straight, you are saying that if you just play and win then it is a smart way? Now let me ask you back, how the hell are you saying that it is a smart way if you just play and lose like the others? The only smart way is to play as the house or either gamble at an Ev + games, other than that you cant call that as smart
Yeah, that's true, not all the time gambling can be profitable. If you are not lucky enough to win the game then you should stop immediately. Because once you've continue playing for sure you will lose more money instead of just saving it.
The only one getting profit in gambling is probably the owner, you are lucky if you still did not lose in gambling (other people losing in the long run) I agree to the comment above, once you have got a profit then you should cash out it, don't play in long run probably you will lose your earning.