Piracy is always the disease of the videogame industry. It is forever making a struggle for publishers and retailers who wish to make money, and it has been blamed for destroying whole platforms, such as the lovely Commodore Amiga and maybe now the PC.
When Crytek brought high-end Crysis for PC it was keelhauled by pirates, and later Crytek president Cevat Yerli has said "We are suffering currently from the huge piracy that is encompassing Crysis." And as consequence, "I believe we won't have PC exclusives as we did with Crysis in future."
Ask not for whom the bell tolls. It tolls for PC.