I think it's important to remember that groups B and C aren't static.
In my, completely unsubstantiated, opinion group B would be much larger for blockbuster media.
Think a new video game from Valve or Id Software or movies like Avatar or Titanic. These types of media don't really need piracy to market due to the fact that many/most people already know they exist. I would also guess that they gain much less from word of mouth, but I'll fully grant that's just an opinion:)
On the other hand you'd have "indy" games and movies, and other niches like anime, where piracy may actually help spread the word about this media and help it gain sales through increasing the size of group C.
I think it's important to remember that groups B and C aren't static.
In my, completely unsubstantiated, opinion group B would be much larger for blockbuster media.
Think a new video game from Valve or Id Software or movies like Avatar or Titanic. These types of media don't really need piracy to market due to the fact that many/most people already know they exist. I would also guess that they gain much less from word of mouth, but I'll fully grant that's just an opinion:)
On the other hand you'd have "indy" games and movies, and other niches like anime, where piracy may actually help spread the word about this media and help it gain sales through increasing the size of group C.