Moore is a crank. He believes that his books stand alone and there is no need to make them into movies. He has stated that he "Has enough money" so the fat movie cash is a non-issue. He's already written off "Watchmen" and will not ever see the movie (at least he says he'll never watch it).
Also, after what was done to "League of extraordinary gentlemen" he has a right to be a crank. I like him. At least he has the balls (and budget) to back up his mouth.
P.S. Anything with Natalie Portman is OK in my book.....She's a hottie. I could watch her paint a birdhouse for hours and not get bored.