It depends whether you're counting law school, business school, medical school, pharmacy school, nursing school, etc. as grad school. Among Hackers grad school is far more likely to be of the type "studying fractal patterns in African architecture while teaching two sections of introductory socio-cultural anthropology" Generally you pay through the nose for the first kind and they pay you (a little) to do the second kind.
It's amazing how few people know that if your PhD doesn't cost -$12,000 a year or less you really are not doing something right.
It's amazing how few people know that if your PhD doesn't cost -$12,000 a year or less you really are not doing something right.