2. Harry Potter himself is now the 30th most wealthy individual in USA, even wealthier than the likes of Micheal Dell (CEO Dell) and Eric Schmidt (CEO Google)
3. Some of his grand revenue sources are - Advertising ($380 million), DVD sales ($1 billion +), packaged good licensing ($11.8 million), music ($13 million+), books ($9 billion), movies ($4.4 billion) etc.
6. Some newspaper or magazine could have published a special Potter supplement and sell it separately in news-stands from the day of the launch.