There's a lot of data about this if you google a bit. One of them is this: http://www.pinchmedia.com/appstore-secrets/ http://www.pinchmedia.com/appstore-secret

There's a lot of data about this if you google a bit. One of them is this: http://www.pinchmedia.com/appstore-secrets/ http://www.pinchmedia.com/appstore-secrets/ It mentions that only 30% of the users use a free app after the first day, and more stuff like that.