I've always thought that conferences / education / seminars was the big sell here. Productivity didn't seem like a starter, simply because work is such a cultural thing with all of its own stresses and getting people to adopt these new techniques is like pulling teeth. Students and conference goers who want to save on the extremely big bucks that travel and classrooms and conference halls can cost will see this as a huge win.

Also, the isolated / focused environment of VR could be a big plus for learning as it blocks out so many distractions. I'd love to see a study done around that.