I went for a job to be this guy's PA and it was an oddly tempting proposition - a $80-100,000 salary for arranging international 'pilgrimages' to meet interesting artists. But after 2 interviews with two members of his team and one interview with the man himself, I wasn't offered the job.
After about 5 minutes in a room with him, I decided the job was not for me anyway. Apparently, writing for 15 hours a day makes a person rather hard to warm to and he was plainly not interested in me. I made a point of emphasising my love of social realism and of British Working Class literature and that, I expect, ended my chances: I am not someone a rich guy who's writing about himself and spending his fortune on himself can identify with!
Meeting him confirmed what I suspected when I read his writing: he is a very aloof individual. I know a lot of writers are isolated but the best writer is a people person, who can empathise with others to create powerful stories. Perhaps, therefore, the more appropriate adage is not 'write what you know' but 'write who you know.'
But good luck to the guy. He believes in his work and he's able to live his dream, something all us writers would love to do. However, at the end of the day money can buy you fame, but it can't buy you talent and he will only succeed if he can show others his talent is as significant as his bank account. I'll be following his publishing venture with a lot of interest, and just a little envy.