If hypothetically the study had said that piracy does hurt sales, would you change your position on piracy? Because what I'm seeing in this thread is just a bunch of people pointing to studies when they support their priors, or to limitations of studies when it doesn't...

Affirmation bias leads to people usually using stuff that prove their point, so probably the commenter would not have changed his position from one study - which is fine. This is how a discussion works. But your comment leads to a dangerous path of just disregarding people defending their positions with studies, and make it seem like these studies don't hold any value beyond elaborating what the people are saying, which isn't true.

Studies, if done correctly, hold massive scientific value and (at least a bit) of "the truth". Especially in the current climate we should never go down the path of disregarding studies.

No.