There is also the fact many who play the pirated versions would never play the game in first place if they had to pay even a single cent for it.Pirating is not the worst thing, Its still bad and if you can, try and support the creators with whatever you can. But games like Skullgirls only became popular because it was pirated so much. (*it became popular because it was a great game and very beautiful and underappreciated until it was spread around due to pirating*)
At the same time, exactly because it's free it causes a reduced appreciation of it money-value.
Piracy is a complex topic