Then he shouldn't have signed on the dotted line. The fact that he did means he has no right to bitch about the situation now (or more specifically, of course he can bitch all he wants, but nobody needs to take it seriously).I think he made most of these deals in the late 1980s and early 1990s (he wouldn't have been hard up for cash at the time, but the big checks for the film rights certainly would have been enticing). It was after the films started coming out that he took a hard line against film adaptations of his work.
I disagree.
We all learn from our experiences (or we should, anyway). It's entirely possible that he has learned over time that certain decisions were mistakes based on how they ultimately turned out.
Or, he could just be a crabby bastard who cashed in early on and now he pees in everyone's cornflakes whenever he's given the opportunity.
Hell, he has two strikes in his favor. He's old, and he's an artist. I'd be disappointed if he wasn't a crabby bastard.