* Maybe students have conditioned themselves to get paid little and be treated with a lack of respect?
* Maybe the sunk cost of a partially completed graduate degree compels students to remain to completion, even when the work environment is toxic?
* Maybe the "flat" management structure of most labs (3 to 30 grad students report directly to their supervisor) allows more abuse?
* Maybe tenure insulates supervisors from consequences for treating their students poorly?
Among my late-stage PhD friends, it feels like 80% are unhappy, either because of deliberate abuse from their supervisors, or because of the supervisor's neglect of what the student needs to finish her degree and progress to her next career stage. Is this abuse as prevalent in industry as in academia?