At a certain point in your career - I mean, part of the answer is a personal answer, which is that at a certain point in your career, it becomes more satisfying to help entrepreneurs than to be one.
Marc AndreessenThe transformation of Apple is probably the biggest tech story of the last 15 years.
Marc AndreessenThere was a point in the late '90s where all the graduating M.B.A.'s wanted to start companies in Silicon Valley, and for the most part they were not actually qualified to do it.
Marc Andreessen