There are plenty of techniques to reach the NYT bestseller list; new internet matketers pay famous internet marketers to tell their followers to quickly buy their new book, hopefully in many copies, often with the cost fully or largely refunded.
The book is usually about how to reach the NYT bestseller list.
What does it mean? Rich parents?
It means a publisher ranked possibility of a positive return on investment for that book to be higher than the books they decided not to publish.