Most likely PC VR buyers already have at least average computer. The only thing they will lack is GPU and maybe RAM. GPU upgrade would cost them 200$, so total would be 500+200=700$ and only if they don't already have any sufficient GPU for 2D gaming.
The problem with VR is dropped frames has a much stronger effect than it does when the same thing viewed on a monitor, too many and it can be instantly nauseating. You want consistent, very high framerates. You're also driving two fairly high resolution screens.
That requires a GPU costing at least $600 to do right. Then you need a computer to drive it.
If you really want it, those 100$ won't make a difference.
If 600 is too much for you, 500 will most likely be too much as well.
If we get in the neighborhood of ~ 350, it'll look different.
But that article is a ridiculous PR fluff piece.