There is no direct practical reason. Other people are giving you the long term outlook view, why it is valuable in aggregate, but if you were aiming for immedia

There is no direct practical reason. Other people are giving you the long term outlook view, why it is valuable in aggregate, but if you were aiming for immediately practical results neither math nor CS would fit the bill. I can't speak for others but for me math is kind of like a brain teaser on crack. It is immensely satisfying to think about and I would imagine most mathematicians get a similar kick out of it. Not a mathematician myself mind you.