First off, everyone rebels, it's part of our psychological growh to become individuals. The smarter ones, i suggest might not use it for petty crap, but for min/maxing on skipping class and going to a party, or putting of school for a year or two to run with a good idea. I say smarter ones, because they are just looking at more variables to crunch.
Secondly, the financial backing of one's support system, or family, has a lot to do with mitigating the downsides of intensive and/or risky projects. If mom and dad are more successful or stable, there is more of a safety net. Couch surfing and ramen/starving might not be for everyone, so a better safety net means less downside.
Self esteem vs low self esteem is a big one too. This correlates to socio-economic economic status. Self esteem will let one believe in their good idea, instead of letting someone tell them it's stupid.
I will agree that the article is slanted twords rich kids, they just had more bonuses.
The interesting thing to me, is I think if you look at middle class entrepreneurs, they will be running their businesses taking less risk (service businesses as tradesmen / lawncare / contracting / etc) for less reward, but are fitting the same mold.