Personally, I never went to college. I'm a business owner now. I worked (consecutively, starting at age 18) on a farm, at two difference McDonald's, for an Office Depot (where I learned sales and management from the ground up), then worked for a dentist, all while doing computer repair on the side and having various side jobs (being a vendor that hangs signs in grocery stores, things like that), just to make ends meet. After I got married, I realized that what I wanted more than anything else was to spend more time with my wife, and the best way to accomplish that was to become self employed full-time. It took a couple of years of saving while living in poverty (sub-$12k/year total family income), but we did it. We've been running our computer shop for 3 years now, and last year grossed $45k.
The moral of this story is that I wasn't driven by greed, didn't go to college to get my ideas, and wasn't born with a silver spoon in my mouth (my parents have never made more than $35k between the two of them), but I'm living the dream. I work when I want to (well, sorta, we have set hours to be in our retail store, but when I want to take a day off, I just pay my mom to watch the shop for a day), and most importantly, I get to spend time with my wife. I'm not a millionaire, but I also happen to be making more money than I've ever made before in my life, though that's just a fringe benefit. The only debt I have is my mortgage. Oh, and I'm only 27.
tl;dr: Greed isn't the only motivator, and college isn't the only place to get ideas and experience.