Because too many of them are busy looking for other people to give them employment (which has been difficult for employers to do), instead of figuring out how to create wealth on their own. If more created their own businesses, they would probably be able to hire the rest — you know, the ones working in coffee shops and retail. See http://www.nytimes.com/2012/03/25/magazine/what-the-fate-of-..., for example.