Check out this page on wired listing movies made from PKD novels; the table compares what PKD or his estate got paid versus what the movie grossed.

http://www.wired.com/wired/archive/11.12/philip_pr.html

$291,000,000 versus $2,050.

BTW, A Scanner Darkly is really very cool. I happened to see it with a friend who had basically lived that same life in the sixties, and he thought it was pretty true to life as well. No, really.

“It was fucking awesome.”

I agree.