Hitler was actually one of the richest authors of all time. The sales from Mein Kampf actually helped fund the Nazi party in its early days. Today, the book has sold over 10 million copies worldwide.
Of course, Hitler died without any heirs when he shot himself nearly seventy years ago. So where do the royalties go? Well Hitler’s nephew could have claimed the royalties, but refused to have anything to do with the book.
The book then became property of the state of Bavaria. Since the war ended, Mein Kampf has been illegal to publish in Germany. But until 2015 when the book becomes public domain, it is still published throughout other countries.
The royalties in some countries just went to domestic charities, like in the UK. But for countries like Sweden, India, and Turkey, Bavaria accepts the royalties and then distributes them to its charities.