I would be interested in if anyone ever did a categorization of torrenters. I have assumed for a while that serial downloading makes up a decent chunk of pirating, but how much would be very important. Basically if you have someone who downloads a game a day, they might need to be treated differently from a more "casual" torrenter.
Of course my thoughts are pure conjecture, finding if that is true or not would add an interesting bit to discussions about this.