They call them “cruise ships” now, because the only reason to float around like that is fun, not business. So they have waterslides and such. Slightly less old-growth hardwood paneling, fewer places where one is allowed to smoke cigars.
But no. There are ten Greeks who could build another Queen Mary as a lark, and that’s just counting Greeks. However rich you think the world is? It’s richer than that.
Zeppelins, though. Those, I will grant you, have gotten scarce. Oh, the humanity.