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Richard Stallman sounds like a good candidate.

Bill Watterson

Grigori Perelman

I can find lot of names but I am lazy and one is enough to prove you wrong http://en.wikipedia.org/wiki/Thomas_More

Your parent literally said "most people," i.e. one example is not enough.

And I have to agree. There's a reason the idiom "every man has his price" exists. Certainly, if a large company offered me billions of dollars for a small business of my own, there are relatively few scenarios I can imagine where I'd turn it down.