From Slate.com
Thesis Hatement: Getting a literature Ph.D. will turn you into an emotional trainwreck, not a professor.
(My own area of interest is more history, but I assume that the same issues would apply equally in that discipline as well.)
From the above article, I also found this link very interesting: Graduate School in the Humanities: Just Don't Go and Just Don't Go Part 2 (Also when I go to the bottom of the article, I realized the author was a professor at Hope College, in my home of West Michigan.)
As I wrote in an earlier post, this was the decision I reluctantly came to myself, although I occasionally still have some regrets about not pursuing a career related to history.  But on the whole articles like the ones linked to above make me feel like I made the right decision.
On the other side of the coin, however, I have many friends and former classmates who are now working as college professors in the humanities.  And sometimes I think to myself, "Well, if they did it, maybe I  could have done it...."