This is the perfect answer to that age-old question of who a writer is writing for. In college composition courses the student is taught to write for/to their audience. I read about one author recently who describes her audience of “one,” one person she pictures as she writes. Well, I like the way you describe it and the examples you use. Of course, someone who writes about zombie is going to attract an audience of zombie-philes!
I still have problems knowing what to write about because my personal topics are pretty dark (not sci-fi dark, real-life dark!). I wrote a list yesterday and today hated all but one. Ha!