RE: The Millionarie next door... you mentioned on germ's site...ya, heard of it. Am hoping my neighbours will write such a thing about me one day.
I do not find the notion that many of the wealthiest are inconspicuous. I live near communities that have many Chinese in one area and Mennonites in another. And have done loads of business with both.
Let me tell you... if there were ever two cultural groups who exemplified living ordinarily while being massively wealthy it would be with these two groups.
I have known so, so, SO, many instances where you would be certain the individuals were very ordinary or even below average or poor. Yet they own real estate all over the place and hold down very ordinary jobs. They are just prudent and frugal. Not to say cheap. But more wise.