Mega dollar systems. 200k on up. What are their professions?

Back when I worked for a top specialist dealer in the near north of Chicago near Northwestern Medical center and medical school, my top customers ranged from some of the top execs at financial institutions, managing law partners, CEOs, the kind of people on the cover of Crain's Business, Chief and attending physicians, and even a union electrical linesman who loved blues and jazz.  Even today, a person I've known for years who works at a local hardware store has a system to die for that I new nothing about until he was asking me questions of his interest in the Gryphon CD player.  You just never know.  But one thing I know they are never young anymore