I mean option to the ownership of PS4. You'll have some PS4 owners with the camera (the fools!) and some without. Bundling the camera with the headset would be a waste for those who own it, but a potential missing requirement for those who do.
I think this is the first time I've seen you argue that a BOM is higher than the rest of us! Usually we're saying Kinect or Hololens or whatever is expensive and you're saying it's $50.
I think $300 at least because VR can charge a premium. That's £200, so £250 with VAT etc. That's not astronomical for a bleeding-edge, totally new and unique experience.
Incidentally I've no idea what the BOM would be and how limiting. I don't know what the panel costs or how high-speed displays are obtained. If they need their own production run and aren't 60 fps panels with some electronic steroids, the cost must be a lot higher. Break out box and frame interpolator hardware will be less than Kinect's internals I reckon (small ASIC).