Furthermore, Sony Pictures is huge, so selling movies is absolutely part of Sony's business as a whole.
It’s not all one Sony. Just like Samsung or MS divisions fight and get into spats.
Consumers are lured into walled-gardens all the time - consoles, app stores, hardware. Where would you suggest someone purchase a digital license for a movie?
From a video game store is the part I find odd. I get walled gardens. Not this one for this purpose.
Movie playback has been a thing for home consoles for decades. It became kind of a joke that the most played Xbox 360 game was Netflix. As more people have moved to streaming media/digital marketplaces, its only natural for those to grow. I've known lots of people who use their Xbox as their main media center that consume movies on Microsoft's storefront. It makes sense Sony would be in the game as well, as after all they even directly produce a lot of content themselves.