From this article... and common sense it is very clear that Sony and anyone else getting into the VR fray need to set up Demos of this product and make it available to customers to see just how ground breaking this is, and that would be costly, if you set up a demo unit for this in a store it is far harder to bolt into a demo unit than say the controllers which are chained to the X1 and PS4 booths which exist, theft and damage to the headsets would mean pretty much having to hire staff to monitor the booths all the time and provide a sick bucket incase anyone suffered badly from VR motion sickness (I'm sure gamestop would be powering the booth off pretty fast if it was just left in a corner to fill an area of their store with vomit and sick customers).
VR has the same issues that the 3DS had, trying to convince people that the games for it look better when you're playing it than they do in magazines or youtube videos but.... the 3DS was only moderately successful at doing that, and Nintendo had the advantage of easily being able to set up demo systems in stores all over the globe, like I said above, I don't see PSVR appearing in local game shops as much as other systems, and that is going to hurt the sales of it far greater than if a PS4/X1 system isn't being demo'd.