>> Italy and Finland aside, Windows Phone is primarily growing is poorer nations where the iPhone is prohibitively expensive

The markets that Windows outsell iPhone are the markets where iPhone has less than 10% market share and where people need cheaper phones. These are not the markets that are attractive to developers (Revenue/user is much lower than developed countries) and hence Windows will not see developer mindshare in near future.

Notice other than Nokia Home base (Finland), Windows does not outsell Android anywhere else.