Other thing is that it is illegal to operate them (maybe not all and/or not on all markets, but most of the time for sure) with a single pilot while carrying paying passengers e.g. charter operations. But if you are an owner-pilot and fly alone or with your family - that's fine!
People who want to 'hack' a plane industry by producing a much cheaper and better light jet should calm down. There is no way to do it. This is not space industry, or car industry, which is dominated by deeply entrenched, century old, corrupt weary monopolies. Existing light jet builders know what they are doing and they work in a real market all the way (this is why Boeing or Airbus doesn't make them - they would have been unable to compete).
He was the Commissioner of US patent office in 1899. Mr. Deull's most famous attributed utterance is that "everything that can be invented has been invented."
By inventing way to build airframes that are immune to both rusting and cracking and will require no X-rays or other (costly and time-consuming) inspections? Sure, people will jump on it! It will be a game changer. But no one seems to be trying.
But not by simply fixing the broken business processes, the way Elon Musk did it with space rockets - building essentially same planes, but 'better'. Because in the world of private jets, things are not broken, that is a real competitive market.
If you are that, please check your ego at the door. One story among many about a man who killed himself, his entire family, and a couple of his neighbors by being unwilling to admit the weather was too bad to be flying.
http://www.dispatch.com/content/stories/local/2017/01/01/div...