I always felt like if you get to a point where you've got enough money to invest in something real, you gotta invest in anything that's related to a natural resource because that's gonna be here forever - so you might as well invest in something that's gonna be here, rather than invest in something
I always thought of vampires, especially the young-adult ones, as a metaphor for sex - sucking blood, forbidden, taboo. I think they just ooze sex. Vampires are all the big themes in life in one attractive, bloodsucking package.