Vampires: Most Profitable Characters in Hollywood

According to the Hollywood Reporter, vampire stories (in film, TV, books, etc) have brought north of $7 billion to the Hollywood industry.

What makes vampires so hot, cool–and bankable? 

www.hollywoodreporter.com/hr/content_display/news/e3iaea240932b26c233ce7281e3e4350d17?pn=1