The punchline of the joke isn’t that it’s weird to put a price on X, but that it makes it rather hollow to start that same paragraph with four different variations of “I would never do X!”.
It’s kind of like an Abbott and Costello routine. I would never do that! How dare you suggest that. You’re a commie. The scum of the earth. I’m above that. Gimme five bucks I’ll do it right now.
> … if they offer me a million…
This is exactly like that famous joke! :D “Mam I believe we’ve already established that. At this point, we’re just negotiating.”