Comment by AndrewDucker

This would be the case if the people who liked the most poopular things ever tried things outside of that, and there was a shared swapping of preferences, and openness on all sides.

But there never is. If you like things that are niche then you don't get a "Oh, that's not something I've heard of, tell me about it!" - and I agree that the world would be a better place if you did.