[ajsalminen]

Not entirely sure about how trustworthy it was but I think I've seen some kind of a study that claimed it affects something like 30% of people. Doesn't really matter if it's majority or just 30% though, still too much to ignore and not all games are able to offer multiple locomotion options.

Also depends on where you draw the line. I've never gotten sick from VR personally but the movement can still sometimes feel weird to me.