It's the Adrenaline Rush -- the Feel That You're on the Brink of Something, But Deep Down You Know It'll Be Okay
The thrill. The scare, even. That adrenaline rush is like a drug. And it freaks you out, but then you get euphoric when you realize everything's okay.
Horror films, horror books: that's exactly the feel you get. You get immersed in those dark worlds, but then you come out of it unscathed (mostly), and it's that rush of good feelings completing the experience for you.
This is why horror to this day is still quite the popular sub-genre of media. With such small-budget films like "Lights Out" and the original "Insidious," "Paranormal Activity," "The Blair Witch Project" and the original "Sinister." Look at any mega-budget Marvel, Lucasfilm or Disney feature out there, and while they're making billions of bucks, a low-budget screamer can recoup nearly five times its investment in the production --
And all because it really makes people scream. You don't need fancy graphics, CGI, or even three hours worth of storytelling. Just a quick hour and a half, people peeing in their pants, and money's made.
And That's Why I've Made This Site: to Celebrate Horror in All Its Darkness
Horror. Suspense. Thrillers. Ghost stories. Vampires. Werewolves. Serial killers. Splatterpunk. These are the stories reminding us that we are, indeed, human. And that's why people love horror.