Give me a call when you find a company that lets its employees work on whatever they want with minimal effort put into politicking/explanation.
Plenty of excellent engineers take unpaid time off work between jobs for the opportunity to work on personal projects without interruption.
Point is, 30-40k/yr ain't bad pay for that sort of freedom.
EDIT: I've been in a PhD program. The reply to this comment DOES NOT describe a normal or healthy advisor/advisee relationship.
Ultimately, there should be a point in every PhD where the student carves out a project and works on that project, and it should probably happen before the student is spending most of their time on research. The student shouldn't have to play politics to convince people to allow him/her to work on their own ideas, as long as those ideas have scientific value.
If you find yourself consistently working 80 hour weeks and answering 2am emails, switch advisors or switch programs.
If you're just working on your advisor's stuff without any autonomy and/or don't have any say in the direction of your or your lab's research, switch advisors or switch programs.
A lot of the "bad press" PhD programs get aren't indicative of a healthy PhD and are not as common as they're made out to be. And never necessary. It's usually a combination of an abusive professor and a niave student. Which, BTW, happens in industry as well ("death marches" etc)
A phd isn't a 40 hour work week kinda gig, but it also shouldn't be abusive. But in general, it's really simple: don't let people abuse you, and if you're taking a pay cut in return for freedom, be damn sure you demand the freedom.