I thought that Jared Polis built up most of his wealth. From what I've learned about him, he's eccentric.
It's complicated. Polis' wealth comes from the dot-com boom, and he co-founded a website with his parents and sold it for a lot of money. (Parents had a greeting card company, Polis figured out e-cards in college.) He then went on to do his own business with ProFlowers.
Polis might be fairly neo-liberal (one of the few detractors of SOPA and PIPA doesn't read as that neo-liberal to me), but he's a relatable guy. (Who really only underperformed in 2010. Hmm.) Also way more likely to run for Senate than Governor, from what I've heard.