Happened to be searching a King-related topic and came across two very old articles. Don't ever recall reading them, although one of them talked about a topic I sort of knew about via Wikipedia (it probably was a source). Thought others might find these vintage pieces entertaining:
Behind the Best Sellers: Stephen King
archive.nytimes.com
Stephen King Has the Publishers Terrified
Authors: After 20 years with Viking, he's shopping his latest book around, asking for a higher advance and royalty rate.
www.latimes.com