Why do apps for Windows Phone 7 cost more than the same app on iOS?

I am looking into getting a Windows Phone 7 device, but i started looking at pricing for apps and realized that for the same app on both platform it was $0.99 on iOS and $2.99 on Windows Phone 7. Why is this?|||because WP7 has much fewer user than iOS, so the developer make the higher price for per app, if you want free apps to download, you can try this site http://download.pandaapp.com/