A MATTER OF MILLIONS THE Clipper smacked the blue of Biscayne Bay and settled into a lazy squat, from which it taxied toward a landing. An audible sigh of relief came from the roped-off crowd that lined the shore of Dinner Key. Little wonder that the sigh was heard, for the throng was immense. Seldom did the population of Miami, citizen and tourist, assemble en masse at the Marine Airways Base to witness the arrival of a Clipper plane. But the winged ship just in from the Caribbean was worthy of a huge turnout. Not only because its passengers were something of celebrities, but because of the cargo that they brought..