If you have a PC strong enough to run VR, you most likely are primarily a PC player.PC only gamers will most likely be buying Vive and OR. Better features, such as resolution, only frame rate would be better. (So far).
The only PSVR games they'd buy would be exclusives, just like the only PS4 games they buy are exclusives.
If it comes out at $399 and they are targeting the enthusiasts, yeah I think PC support would be smart.
However if they go for the mass market price of $199 then it needs to be exclusive. With this strategy they'd be making money off software and expanding the VR market, not off the hardware. OR and Vive cannot go this low.
So there's very little reason to suggest they'd be buying PSVR for PC only.
PS/PC gamers on the other hand
Will likely be having to choose between headsets. PC probably is the better choice.
For this group, no PC support means lost software sales for PS, as well as lost hardware sales.
Even if they're only buying it for exclusives, those games would do better and make the picture for VR that much brighter for Sony.
This means more exclusives down the road.