re: Why reject?
Maybe somebody in the film industry should read the book.
That's what happened with Apollo 13. The movie was made because Lovell first wrote the book.
It seems quite unfair: a spaceflight mission must go wrong AND one of the crew must want to write about it and it becomes a movie.
But there are plenty of extremely spectacular spaceflights that were very successful and none of the crew felt like writing a book for the large public and no movie would be made of it.
Raoul