I really enjoyed Carol Clover's update of the "final girl" theory and other horror tropes.
But (I think) the movie is really about underground horror. Independent films that feature torture, rape, mutilation, and murder without any pretense of storytelling. The people who make and act in these things were curiously engaging, much like the people in the porn industry.
These films are sold directly to people with very specific tastes. Some are actually made to order.
I didn't know this existed and I don't want to go there.
This all made me realize that my enthusiasm for slashers and zombies is about as edgy and rebellious as looking at internet pictures of cute baby animals.