Windows Phone is almost as popular as IOS now: http://www.theguardian.com/technology/2013/oct/01/microsoft-nokia-smartphone-windows-phone So, if you think IOS is worth supporting, why not support the OS having the phones with the best built-in camera...
Let me join the group of people who joined the forum to ask for Windows Phone support. I know keeping a software current on several platforms is a lot of hassle, but having at least the basic functions available in WP would be a great help.