I will let someone more knowledgeable answer your question, however I can throw some light on why people would spend more on a "serious" aircraft.
exactly the same reason, why some buy a Ferrari or Porsche,
you can only do 70mph, legally, so why are we not all driving around in 900cc
diahatsui's ? answer personal choice, if you have the money, why not,
spend it all, while you can enjoy it, rather than leave it to Brown