I suppose it depends on how you are thinking about profitability. But I would suggest that "profitability" is not the best criterion by which to judge a joke, or perhaps any speech, because we are not in control of outcomes. Foolish jesting is not convenient - no matter what the result is. God could overrule the foolishness of the jest and use it to make someone seriously consider their ways: that doesn't change the foolishness of the original jest. So what you rather have to ask yourself is if a joke is good (not merely in the sense of funny, but also in the sense of pure) and if it is the right moment for it.
Thank you. I would still want to ask one more question. Should we not always mean what we say, and say what we mean? I just cannot see why we should conceal a truth from others, and after having made fool of them, reveal the truth to them, instead of just immediately delivering the truth. I just don't get joking. It's feels so pointless to me.