If you look through my writing files you will see an abundance of paranormal creatures. I have vampires (naturally,) werewolves, mer-people, spirits inhabiting people, a boy who grew cat ears, demons, angels, androids and trees that can move. All my stories contain something out of this world, an element that makes it supernatural. I love writing these types of stories too.
What about a non-paranormal story? Would I write one if the idea hit? I can answer that and it may surprise you to learn that nope I won't.
I had an idea for a story. There were no werewolves or vampires, nothing out of the ordinary. Just two boys in a small town hiding their love. They get discovered and one gets beaten to a bloody pulp and the other thinks he's dead and runs away. As the years pass he grows up bitter, becoming a hitman for a mob or some other type of violent job. He winds up going back home to get revenge and low-and-behold sees his childhood sweetheart alive.
I have very little desire to write this story. And don't think I didn't try to give it a paranormal twist. Ghosts I thought then realized no one had died so ghosts were impossible. The middle is completely undeveloped. I know nothing of writing something as nitty gritty as this would have to be. All these excuses served to convince myself that no I don't want to write this story.
I'm just a paranormal sort of writer. I love writing them and reading them (yes I will read non-paranormal stories and have read some very good ones.) There's just no motivation for me to branch out, try something normal, something less fantastical. I'll gladly leave that task to others.