People drop out of school and out of university for all the wrong reasons. Laziness, unable to look past the next test to the larger picture of what being educated is all about.

The people that drop out for the right reasons may have such motivations as 'I can't learn faster or more here than elsewhere', 'the company I started needs me more than I need a degree' and so on.

Those people aren't really dropping out. They're taking a short-cut because they already accomplished what the people that stay in the program are still trying to achieve.