For the sheer joy of it. I learnt Sanskrit in middle school formally yet superficially. About a year ago I decided I wanted to get rid of the 'superficial' part and devoured several Sanskrit grammar books including this website. It has been a very joyful journey and I feel very happy when I am able to read and understand the only Sanskrit newspaper in the world. I don't know about you but for me that's a good enough reason. Sometimes one makes the journey because the path is so much fun even though the destination may be uninteresting.