Horror movies started to wane around the onset of World War II, and after World War II, when all the troops came home, people weren't really interested in seeing horror movies, because they had the real horror right on their front doorsteps.
If I had unlimited funds, wall space and storage, I would collect a lot more things, like 'Planet of the Apes,' 'Star Wars,' science fiction stuff, autographs, and prop guns and weapons. I have to draw the line somewhere.