Another thing with a PhD is that it is no guarantee that you'll even be hireable. I know of a number of PhD candidates who have trouble interacting in a professional setting outside of the of 'I deserve deference because I have a PhD, you don't necessarily even deserve respect' mentality.
I find sometimes a PhD can come with very ingrained attitude issues. I recall working for a company with a new-recruit development program where really the only way to fail out was through attitude issues. One of the people who oversaw the program mentioned that she's only ever seen people with PhDs and higher fail out over this issue.
I wonder if the same people would have failed out of any job requiring human interaction. One thing graduate education does is attract people who know that they would struggle in a mainstream work environment for whatever reason. Some are outright crazy.
Quite possibly. I do know it's common to the point of being a trope that some graduate students are just in graduate school to defer having to enter the work-force. Some see it as a way to put off having to make major decisions or processes like job hunting. Not like there's no real reason some opt to do things like that. It is markedly easier to accept scholarships and do the grad school circuit than find a job if you have mid to high grades.
I find sometimes a PhD can come with very ingrained attitude issues. I recall working for a company with a new-recruit development program where really the only way to fail out was through attitude issues. One of the people who oversaw the program mentioned that she's only ever seen people with PhDs and higher fail out over this issue.