Henry Rosovsky said this quote

“ Active scholars are uniquely attracted by a high-quality graduate school of arts and sciences. Faculty members consider the teaching and training of new generations of graduate students as their highest calling. They believe that working with graduate students maintains and develops their professional skills more effectively than any other activity. It may be the main reason for the great attraction of academic jobs. Laboratory scientists have told me that the opportunity to work with graduate students keeps them in the university. For them, other options would center on research in commercial laboratories, but there the principal investigator would be assisted by technicians, and that is considered a far less creative interaction. ”