I think you're confusing some issues here. In the case of copyright infringement it is clear that sales were lost. The question is just how many and that is w

I think you're confusing some issues here. In the case of copyright infringement it is clear that sales were lost. The question is just how many and that is what can't be proven. It's true that numbers the media industry claims are ridiculous when compared against their projected growth before file-sharing took up widespread use but that doesn't mean their loss was $0 either.