Someone clever once said, apropos of the Justice League, that the only thing sillier than an adult dressing up in colourful tights to fight crime, was a whole roomful of such folk. That’s a good analogy for films, TV shows and books that posit elaborate secret societies of vampires, werewolves and other supernatural creatures that operate just below the radar of human awareness. One vampire or werewolf is powerful as both a character and a symbol; a roomful of them is just goofy.

Alex Bledsoe
No Mortals Allowed