Personally, I think it would be cool shit if I were ESTJ or ISTJ rather than ENFP (e.g. same cognitive functions, but the other way around). In fact, I was one of the very few on here who answered the poll, "I wish I were S, but I'm an N." So I don't want to be part of some allegedly elitist what-the-fuck-ever.
That being said, I don't really think it is all that elite. In a population of nearly 6,000,000,000 that means there are approximately 30,000,000 INFJs. Could it be...in some strange coincidence, that 200 of those 30,000,000 happen to hear about MBTI, get interested in it, find out about typo c, and come here? Um, it 'ain't' that far fetched, now is it???
Sure, people get mistyped. Sure, people wanna be special. Sure, people want to escape from the drudgery of everyday life.
But does that mean 80-90% of people here are mistyped? Could be. Probably not. I'd say rough estimate 0-25% mistyping rate could be reasonable.