What's the fuzz about vampire/werewolf movies?

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I'm planning to have a movie marathon (about 4-5 movies) and so I went to a local shop here in my country selling DVD movies. The vendor recommended me to about 4 different movie titles that tells stories about vampires against werewolves... much of these movies are just similar to the Twilight saga movie; love story of a human to a vampire and werewolf (Gosh, I dislike that movie). Here in my country, local television drama is even making a TV series out of those vampires and werewolves. What's with the vampire/werewolf theme that movie producers are making a bunch of film out of it (may it be with a big budgeted or low budgeted film)? The freaky part is.. the movie theme really sells a lot and never goes out of time. Just think.."The Lost Boys" to "Interview with a Vampire" down to "The Twilight"... the vampire theme seem like an immortal too; it never dies.