Depends on how many lights you have, and how often you need to do it. I've installed extra wires from all light buttons so one master switch per room, not as flexible but same cost over 10 years. It saves me a ton grief every night turning off all the lamps in the apartment, some partners never learn that light switches can turn something off. The monetary savings are not enough to break even in 20 years, the time saved is priceless. ;-)