Google “beautiful boats” and you will be treated to an assortment of large yachts: some sailboats and many powerboats, but mostly all new and all expensive. They are beautiful, but those who don’t know anything about boats think they need one of those to maximize joy. Owners privileged enough to gather at the Monaco Yacht Show, the most-exclusive annual gathering of yachts on earth, explain their ambitious outlook to reporters: they’re never…