Considering that the PS4 APU has trouble delivering 1080p/60fps consistently I don't have that much faith in the PS VR delivering a good first impression of the tech.
The PS VR will come with an "extra device" to drive the VR, Sony didn't say what is it, but most likely is an eGPU. Otherwise, there is no way it can deliver 90FPS with good graphics (yes, they said it need 90FPS to get good VR experience, 60PFS may be good for playing video games on TV, but not VR). And I guess this is one of the reason why the VR package is more expensive than the PS4 itself, because that powerful eGPU(s) is expensive.
IMO, that Amazon price accident is not a 100% accident, but Sony want to know how public react to this price. They sell the PS4 at a too low price. AFAIK, which is actually lower than their cost (I mean the total cost, not just the hardware's value), they lost money by selling every single console. And this is the reason why they try very hard to make the new "cut down" version (on the other hand, MS making an upgrade version XB1 with SSHD and a much better controller, because they can make more money by selling more and better hardware). I am not sure if Sony can do this again on the VR. Even though Sony can get extra income by selling games, but at this moment, most of the profit in the console gaming industry goes into MS pocket. Sony get the market, but not the money (like the Android's phone).
They may want to get some money back by selling the VR hardware. TBH, I really doubt if they can do it. The public already react to that "leak price", and most people said it's too high (because they compare it to that "abnormally low" price PS4). And now Sony stuck. If they sell the VR at a
"proper price", gamer may not buy it. But if they sell it at lower price again, they may again lost more money by selling more hardware, which is not a good idea for them.