Because I need a place to dry my laundry, which ends up being on the shower curtain rod, which is higher than I can comfortable reach. If I'm putting something on a hanger, the reach is fine. Things like underwear and socks I can slingshot up there, but big things like my sheets have to be hung from above.
Don responds: There's a washing machine in my bathroom, so to be frank, it would more trouble that it's worth to get someone else to do the laundry.
My first seven trips to Russia I always washed my clothes in the bottom of my shower. This is a major improvement.