I'm really not sure how vampires came to be such an interesting topic. There's so many concepts in there that are just too interesting to leave alone - eternal life, the romance, the things that are lost versus what is gained. It's a haunting tale, and full of questions - what if a vampire were to fall in love with a human, whose life is terminal? What is it like, to stand still, as time moves on around you? Are you lost to history forever, condemned to watch it all pass you by?
Something like that makes you appreciate life that much more, and reminds you to move forward. Because unlike vampires, we don't have a few millenia to make up for our mistakes. We have less than a century. That is, if you're one of the lucky ones.