If you're talking about assigning types to famous people, it's probably because intuition is more common amongst artists (writers, musicians, etc.) Also, maybe there's a reason that N's are overrepresented in books/movies? I don't think it's that we're typing wrong, I think it's that writers of fiction tend to create more N characters, perhaps because the writers tend to be N's themselves.
If you're talking about forum members, it's probably because N's are more interested in personality typing, to the point of going on forums to discuss it. A lot of this is very theoretical and concept based, so it makes sense that it would appeal to N's.
"Imagination creates beauty, hope, magic, and happiness, which are everything in this world."