I think the idea is that it only adds $20-50 to the first phone purchase. You can use that first charger for all later phones. In the end it should work out be

I think the idea is that it only adds $20-50 to the first phone purchase. You can use that first charger for all later phones. In the end it should work out better for you. You no longer have to buy a charger you don't need with every new phone.