Epictetus warned us not to go to graduate school twenty centuries ago — even if we could always go to law school become tax men as a back-up:

Thus, some people, when they have seen a philosopher… wish to philosophize themselves.  Man, first consider what kind of business this is.  And then learn what your own nature is; can you bear it?… Do you suppose you can do these things and keep on eating and drinking and enthusing and sulking just as you do now?  You will have to go without sleep, labor, leave home, be despised by a slave, have everyone laugh at you, have the worse in everything, in jobs, in lawsuits, in every trifle.

Encheiridion, 29.