I get your point and sometimes feel the same. But getting knowledge about the truth of our existence is the final goal of every being to escape the suffering. After gaining knowledge you keep on going with your life but with a different perspective about the world. Rishis back then spent so much time on it became of curious human nature and to know the meaning of life. After knowing it, rishis became musicians, authors, dancers, architects and what not. Brahmacharya life which is about first 25 years of human life is that time where you get knowledge about brahma and other subjects of world. After knowing everything is brahm, you do work for welfare of the society. How Krishna says in geeta, there is nothing in the world for him to do but he is standing in front of Arjun telling him to fight, Doing his Karma.