Tolle is a failure compared to JK Rowling. His books cannot be made into movies. I can say the same thing as you but with JK. If you want to become extremely rich then write several books that many people love reading and that can be made into movies.
Saying it is easy. Doing it is not so easy. Wiki. says:
As of March 2011, when its latest world billionaires list was published, Forbes estimated Rowling's net worth to be US $1 billion.[9]
The Power of Now and A New Earth sold an estimated three million and five million copies respectively in North America by 2009.[5]
The Potter books have gained worldwide attention, won multiple awards, sold more than 400 million copies[6
About Rowling's 4th book:
In the US, the book sold three million copies in its first 48 hours, smashing all literary sales records.
The sixth book, Harry Potter and the Half-Blood Prince, was released on 16 July 2005. It too broke all sales records, selling nine million copies in its first 24 hours of release.[64