Comment by ffsm8
If it does, then the author is sadly misguided and got convinced of someone that isn't true.
The people that download the book from these sites would never have bought them. Having your book downloaded by 10k people doesn't mean you've lost 10k sales, what it does mean is that you've got up to 10k people that wouldn't have bought the book anyway talking about it, effectively becoming word of mouth advertisers.
This isn't quiet as true for movies/tv series etc, because their value (entertainment time/price) is so much lower. Books on the other have usually cost $5-30 and will take 4-30 hours to read through. At that price point, very very few people will download the books to save what amounts to a single meal. Especially if you consider that so few people actually read several books per year (that's essentially $<30 per year "saved" via illegal downloads)
It could become an issue if a for-profit company could serve them legally however, I agree with that. It's hard to really talk about that, though ... It's a pure what-if/speculation after all
Ah yes, the piracy never hurt anyone approach.
How many of those 10k purchases didn’t buy it because it was available for free somewhere? The point is, as you said, you don’t know.. However we do know the opposite is true, once Napster went away people started paying for Pandora. Netflix password crackdown lead to increased subscriptions.
When your desirable product isn’t available for free, people will trend towards buying it.