Cheaper/easier/logistically to make one premium edition than two different SKU's.
Same happened with the Wagakki Band Live Premium Set (2 Blu-Ray, 3DVD, 2 CD)
I see a lot more going this way. Every DVD that is sold, will also sell a Blu-Ray (vice-versa) and when you are printing a certain amount the cost is negligible.
It's similar to a Blu-Ray/DVD combo pack.
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