At the 43rd annual Motor Boat Show opened in Manhattan’s Grand Central Palace, Dutch FEADSHIPs sailboats and cruisers are sold at prices well under those of U.S. yards.

J. P. Morgan was once asked by a friend: “How much does it cost to run a yacht?” Boomed the great J.P.: “Sir, if you have to know how much it costs, you shouldn’t own one.” Last week, as the 43rd annual Motor Boat Show opened in Manhattan’s Grand Central…