Usually because <minor> has made a prototype of an already well-established phenomenon, and the really difficult part is making a production-ready design. A bi

Usually because <minor> has made a prototype of an already well-established phenomenon, and the really difficult part is making a production-ready design. A bit like the "10-year-old makes a heart pump for just $10" stories. It's really easy to hook up a motor to some pipes, it's absurdly hard to make that pass medical regulations.