WotC is trying to walk a fine line between promoting their digital service and not undercutting the LGS. That's what the alt covers exist at all. They're purely a gimmick to promote LGS sales, because WotC considers the LGS an essential part of the community ecosystem.
That's why the alt covers are LGS only. That's why buying digital copies of the physical books is just as expensive as buying the physical copies, and the only discount is if you buy the digital/physical bundles. They're trying very hard not to undercut the LGS price ...but they're still dipping their toe in digital only additions. Like I said, a fine line.
