you are right but for value investors, I think that Oculus Rift could have a quite a big impact on the intrinsic value of Facebook, now the risk is, can they get it right? A non-gaming company getting into 3d virtual reality? Clearly, Google (actual experience of making hardware) doesn't think the timing is ripe yet.
What we have with Oculus Rift is that they were spooked by Sony, and decided to cash out while they still could.
VR will be a major major step for Sony if they get it right (which they are likely to do so) with PS4. They would absolutely own this space with their experience in 3d entertainment hardware.