I've had some of my stuff optioned and it's an...interesting....process. On the one hand, you're getting paid for work you've already done, which is nice - but you have to be ready to accept that the final product (if it even makes it that far) may have little to no resemblance to the thing you actually wrote, as studios, directors, actors etc all get involved and want to put their stamp on it...
Oh, sure. If I ever get lucky enough to get a novel optioned, I'll understand going in that I'm selling them the right to create
their story based on mine, and that it's out of my hands thereafter. An adaptation is its own distinct entity -- that's the whole point of it. It doesn't supersede or overwrite the original. As Greg says, it brings new attention to the original, even if the adaptation turns out badly.
Greg may recall that in
Only Superhuman, which he edited, I included a subplot about the heroine being annoyed at repeated reminders of a terribly melodramatic biographical movie based on her early life, which I put in as a bit of pre-emptive metacommentary and distancing in case someone made a bad movie version of the novel. I recently re-read Isaac Asimov's
The Robots of Dawn for the first time in at least 30 years (part of a comprehensive Robots/Empire/Foundation chronological re-read that I've meant to do for that long but never got around to until now, since I wanted to do it before watching
Foundation on Apple TV), and I discovered that it has a subplot of Lije Baley being annoyed at repeated reminders of a terribly melodramatic "hyperwave dramatization" of the events of the previous novel
The Naked Sun. I wouldn't be surprised if I'd been unconsciously inspired by a memory of that, and I wonder if Asimov himself was making a metacommentary about his experience with failed movie options for the Baley/Olivaw novels over the decades between the two books.