Nonetheless, if you do an excellent Ph.D. in a well-regarded graduate school, you should be able to get a job in philosophy. In addition, advanced education in a discipline such as philosophy that requires clarity and precision about extremely complicated material prepares people for many positions outside the university, for example in public service and in high technology. Employers are increasingly interested in how fast you can learn and what you can do with what you know, rather than what you know when they hire you. Many of these positions allow at least some of the independence of mind that philosophers cherish and some of them pay very well. More generally, the world is changing so fast that no one can predict what kind of training is going to pay off twenty years hence.
Philosophers have that kind of dedication and clarity.
Having said all that, the best reason for undertaking graduate study in philosophy is still that you love philosophy, have a passionate interest in teaching and writing it, and think that you might be good at doing so.