I can only see one case where it is sustainable: a Collector's edition look-alike. Something that makes the purchase worth the money, because every buyer will compare it with the digital version. So it needs to be better in every way.

• Account linking? Optional
• Base game with all DLCs and extensions
• Game OST in the best quality (FLAC) in CD format
• Game book with devs talking about behind the scenes (printed on real paper)
• Poster
• A beautiful case