The only reason that I would do it is because I am one of this people that find it impossible to actually be able to cut/file my right hand nails. I can do my left hand side as I am right-handed. So I have to have someone else do my right hand and you can't go in for a one hand job (well, at least for a manicure.) I can do my own pedicure. The same would apply if I wanted my nails to glisten.