You do realize that Bungie has absolutely no control over foreign pricing? That is all on Activion's side. People are properly annoyed by this price issue, but have a basic understanding of how business in the gaming industry works before starting to make pointed criticisms.
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You're quite correct that that's the publishers domain but a developer could be far more vocal and influentual of the matter, particularly as this pricing is out of step with Activision's other offerings and may singularly or disproportionately affect Bungie.