1) Sony have experience in manufacturing and general supply chain management, vs likely very limited experience between oculus and Facebook.
2) cheaper to have a single panel vs two on the OR.
3) entry level PSVR could be headset only which saves money on the camera and controller (could be $100 saving right there)
I could see PSVR being $399 headset-only, but it might not be easy for them to go much cheaper, assuming OR is selling at or near cost.
Vive conversely :
1) two tracking lighthouses vs one webcam
2) two motion controllers vs one non-motion controller in OR
3) HTC aren't in this as a charity and have no platform to push unlike Oculus/Facebook or Sony.
I could see Vive being $1-200 more than OR
A few points:
1) Supply chain management and the manufacturing stuff only matters in terms of bulk purchasing. Neither company is making a massive commitment to buy X millions of components until they see what demand shakes out to be. This is different than with the consoles where there is some history.
On a small run product like VR components, I highly doubt anyone is getting preferential pricing. The manufacturers need to adjust their lines to make this stuff and for a small run on these components it will not be cheap. These headsets are using components made by other manufacturers and combining them. Facebook/Oculus and Sony are pretty much in the same boat here. Hell, Valve is in the game and they don't have the heft of either of these companies.
You are giving this line of thinking way too much stock. Pricing difference between the two will be based on spec difference. OR will be higher end but subsidized by the user building their own PC. PSVR requires a customized external processing box to work, which isn't going to be cheap.
2) Yes this will be cheaper, but it also goes back to the spec difference.
3) They can release a headset only, but the user would have already had to pay for the two Move controllers and the sensor which is $100. If they release this model, I expect $400 and the main one will be $500. You can't say Sony launched cheaper at $400 if they don't include the items that are required to run it because they assumed the customer had them.
4) HTC will be more expensive, but that is due to premium offering they are pushing. Sony and Facebook are also not charities.