Square has been milking Final Fantasy VII for what seems like an eternity now…well, okay, it's been about four years, ever since the DVD release of Advent Children in 2005. And after Dirge of Cerberus, Crisis Core, Blu-Ray Advent Children, and other FFVII related stuff, Square-Enix still has more to release. As you may know, there are two versions of the Blu-Ray Advent Children release, one with just the movie, and another with a demo of Final Fantasy XIII.
Well, in total, 100k copies were sold on the first day of release. But 70k of those were made up of the FFXIII bundle, leaving sales of 30k for the stand-alone Blu-Ray. Moreover, the demo bundled Blu-Ray package also cost 1000 yen more (about $10), but it's evident that gamers didn't care about paying extra for the demo and it's also entirely possible that a vast majority bought the Blu-Ray bundle specifically for the demo, and not Advent Children.
Hey, whatever the case may be, Square-Enix made the right move by offering a demo, even if it is one that demonstrates the game in an early and unflattering light. And hell, there's still another Advent Children release scheduled for June, called Advent Children Complete. Following that, all that'd be left is to give us our Final Fantasy VII remake!
Related Game(s): Final Fantasy XIII