Well, it all comes down to money, doesn't it? You can buy a secondhand Cirrus with rocket for half a million dollars. Can somebody get me an insurance quotation for a Cirrus?
Nope, can't afford that either.
So if you are such a valuable and important person that your time is seriously worth the same as a professional football player, you can buy the plane, the rocket, and skip the training!
In the end, the lawyers set the boundaries, how much is my life worth? (not a lot, no longer under warranty). If the plane I am passenger in goes splat, how much will the underwriters have to pay out?
Believe me, for most of us, unless young, skilled, and living in the Western world, not a lot.