It's just to get VCs on board with his plans for the future. I'm pretty sure Zuckerberg bought Occulus thinking of the gaming possibilities first, like everyone else who is normal also did, because there's real future for VR gaming. But Zuckerburger is currently facing slowing growth numbers for both Facebook AND Instagram, his two biggest cards, so he looked at his portfolio and now decided that VR is the future.
It's just to get VCs on board with his plans for the future. I'm pretty sure Zuckerberg bought Occulus thinking of the gaming possibilities first, like everyone else who is normal also did, because there's real future for VR gaming. But Zuckerburger is currently facing slowing growth numbers for both Facebook AND Instagram, his two biggest cards, so he looked at his portfolio and now decided that VR is the future.