First there was Harper Lee’s discovered manuscript of Go Set a Watchman and now there’s a new Dr. Seuss book: http://www.cbc.ca/news/arts/new-dr-seuss-book-what-pet-should-i-get-makes-debut-1.3164902. Both were written over 50 years ago. Over 1.1 million copies of Lee’s book were sold in the first week, and the publisher of What Pet Should I Get? is having a first print run of 1 million copies.
Readers always want more of their favourite authors!