If you are interested in it it can't hurt. I'm a double major and they have nothing to do with each other. One is for a career, one is for fun.
It never hurts to keep your options open, and having more than one degree in more than one field helps you do that.
Plus if you ever plan to start your own business it can't hurt. A lot of companies like to see someone with business experience as well as experience in their own field.