Kellogg's and Campbell's moats have also shrunk due to the increased buying power of supermarkets and companies like Wal-Mart. The muscle power of Wal-Mart and Costco has increased dramatically.
Vampires get the joy of flying around and living forever, werewolves get the joy of animal spirits. But zombies, they're not rich, or aristocratic, they shuffle around. They're a group phenomenon, they're not very fast, they're quite sickly. So what's the pleasure of being one?