This is why we get sequels!
I love the way this graph takes the same information and re-sorts it, by body count, time to first kill and box office gross. Interesting to see that the Exorcist, despite far fewer films is on top of the box office. This graphic was done in 2013, prior to the emergence of the Conjuring, which would certainly make this list, and once they get the sequel to It into theaters, that would leap to the front of the pack. (Low on the kill meter though.) I think Paranormal Activity would creep up past the Omen, with the additional $32 million earned for Paranormal Activity: The Marked Ones (2014). Bonus points for legibility and clean arrangement!
Graphics by Reddit user Fur Eel: