At a party given by a billionaire on Shelter Island, Kurt Vonnegut informs his pal, Joseph Heller, that their host, a hedge fund manager, had made more money in a single day than Heller had earned from his wildly popular novel Catch-22 over its whole history.
Heller responds, “Yes, but I have something he will never have — enough.”
I don’t disagree with your analysis of what he’s doing, but I don’t think he’s joking in the sense that he doesn’t mean it. He’s “joking” in the “haha just kidding… unless? 👀” sense.