Didnt even mention prices, but bogus point anyway since many million dollar + boats are sold. If you cant afford a Hinckley, or Alva, or Silent, or any of all those others, thats your problem, not the tech, or the companies that make them.
All I can find on the boats you mention are a Hinckley runabout. Neither Alva nor Silent appear to have manufactured any boats. Links to cruising boats ?