That's a pretty good justification for your grabbing a pirated copy, but that doesn't have much bearing on whether your comment was valuable. A downvote for your original comment is (I hope) a judgement about the value of your comment, not about your moral character.
The intended purpose of my comment was to highlight the following anecdote: it seems that books are pirated the day they come out, which is already pretty usual for movies and software, but, to my knowledge, not for books. Cheers!