Why is everyone obsessed with vampires?

So when I got home tonight I walked in to my family room to see my brother watching True Blood.  For those of you who don't know, True Blood is one of HBO's most watched shows.  I did not know much about the show until I decided to sit down and watch it.  I felt like my IQ was dropping the more I watched.  From the episodes I was privileged enough to see, what happens is a bunch of redneck vampires drink blood, get angry a lot, and have sex every 20 minutes or so.  And I thought Twilight was stupid...  I will never understand what this country's obsession with all of this vampire stuff is all about.  I get the Twilight craze though... young girls who don't know what a good book is want to read about "falling in love" (I've even heard that there are grammatical errors in the books).  But True Blood was downright idiotic. The worst part is that the audience of the show is mostly adults! Grown men and women actually enjoy it!