Following up on recent comments about great Radio announcers who are promoted to management and don't do so well, reminds me of Terry David Mulligan's autobiography, which takes the question one step farther, and asks (but doesn't completely answer, as he is talking about himself) why some very good DJs are horrible to work with, let alone work for.
Beyond that, Radio is not alone in this respect. For example, there are books written about why, in the Computing field, it is a bad idea to promote your best Computer Programmer into Management.
Since those books were written -- the beginning of the 1970s -- there has been a better understanding among senior managers that Management requires some combination of education/training and personality. The most important combination is commonly called People Skills.
In other words, what it takes to be a good DJ or Newsman is different than what it takes to be a good Manager.
We've all worked for lousy managers, and some of us have been lousy managers at one point or another in our lives. What do you think?