Rationally, there is no point in a lot of things (up to and including just sitting idle as a respiring organism). Do you get your sustenance from an IV bag of the basic chemicals your body needs to survive, or do you eat food that you enjoy the taste of? Do you cover yourself with a burlap sap, or do you wear clothing of a design you prefer? Do you get to work on your own locomotive power (walk, ride bicycle) or use a vehicle?

Variety is the spice of life. We do things that we find intellectually and emotionally stimulating.