Leaving aside whether pirates would pay for the item, the idea that someone has a right to future sales is wrong. The guy who opens a competing business "hurts" Best Buy in exactly the same way that a pirate does, but this doesn't mean that he's actually taken anything from them, because they don't own future sales -- they only hope to eventually own them.

[Edit: but, reading down the page, I see that pg already made a similar point more concisely. Oh, well. :) ]