Traditionalists usually say its greatest value is predictive.
Yes, prediction has great value, but we still have to live our lives accordingly.
''But if it does not aid in the acquisition of riches, fame, and the like, we shall be able to say the same of all philosophy, for it does not provide any of these things as far as its own powers are concerned. We should not, however, for that reason be justified in condemning either philosophy or this art, disregarding its greater advantages.'' - http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Ptolemy/Tetrabiblos/1A*.html#3