Everything has to be salt-proof. Corrosion even in coastal homes is huge. On water everything starts to rust within days. Plus exponential growth in size - larg

Everything has to be salt-proof. Corrosion even in coastal homes is huge. On water everything starts to rust within days. Plus exponential growth in size - larger boat means bigger masts, bigger sails, bigger winches to move it, more power to winches, bigger generators, larger fuel tanks. You should compare it with airplanes which would make it sound like bargain...