Hmmm..,,I recall a movie about just this subject. One clone would stay up in the satellite while the others were frozen until a part was needed for his original on earth. Then he would wake up another clone and prepare for the ship that would arrive to take him to earth where the doctors would harvest the needed organs.
Is it ethical? Hell no! They may be cloned on the outside but that does not make them the same on the inside. It would indeed be murder, but good news! Lab geeks are even now perfecting the cloning of organs themselves without the need for a body to keep it alive. Thankfully this scenario will not likely happen. Hurray science!