1) it is totally unfair for the honest buyers if other people can get it for free in an "illegal" way.
2) The IP holders may simply don't want people to get there work for free, irrespective of the fact "they are not going to buy it anyway!". I've seen lots of indie artists express such opinion.
Ultimately, I don't think that's something bystanders have a say. You (general you, not "you" you) can't force your "rational analysis on economy of privacy" on the IP holders. Large game companies obviously almost only care about the profit, so you may assume they think that way. But that can't be applied to everyone.