That's true that he convinces the youth of the value of philosophy. But, that doesn't mean there wasn't any value to the rest of life. In fact, it may give the rest of life more value, since the rest of life can be lived in light of the importance of philosophy. Socrates himself served in combat, and was noted for his bravery (recounted in Symposium). If memory serves, he attributed this bravery to his interest in philosophy.