[Serious] Generally speaking, is philosophy a worthwhile subject of study?

[Belacqua]

To the OP: asking about value, i.e. the worthiness of philosophy as a field of study, is by definition a philosophical question. As such, to ask the question is to affirm the conclusion.

This is why the endless back-and-forth about whether philosophy assists modern science is nowhere near the heart of the matter. It only seems important to certain monomathic people because they have decided a priori that since only scientific inquiry is worthwhile, only those things which serve science are good. 

But questions of values, ethics, aesthetics, and other fields not approachable by science are obviously philosophy, and obviously worthwhile.