I'm in the US and don't know anyone with one personally, but I did try one out at the store. Though I was looking at houses on Zillow yesterday and saw one sitting on the desk in one of the shots. I suspect the home owner works for Apple, due to a lot of the other stuff that was also in the room.
I think the price is the main reason few people know anyone with one. VR and new tech aside, how many people do you know who would spend $3,500 on a computer? Of that list, how many people do you know who would spend $3,500 on a secondary computer? I'm the only person I know who would even consider it.