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Infj & Intj are supposed to be 1% & 2% of the population or something so it seems pretty popular here lol ^^
Not too surprising on an enthusiast forum on the Internet. The other personality types are all out doing things called "partying" or "having fun" or "sex."
Seriously, though, people who are willing to devote a significant portion of their lives to exploring the depths of a particular hobby or interest (as opposed to amassing a large collection of interests and activities but not spending a lot of time with any particular one), especially a solitary one like headphone listening, are more likely, I believe, to be Ixxx types.
In other words, the very nature of the Internet forum--a place where lots of people can gather, without actually having to suffer each other's personal presence, and get down to the minutiae of a given topic--attracts these types, so there will be an unusually high concentration of them.
I personally find conversing with people on a forum much more comfortable than talking to people in the real world. Live conversations are wild, unruly, inconsistent, and largely directionless affairs--especially as the number of people involved increases--and I have trouble keeping up. Fora are much more structured than free-form conversations, with sub-fora devoted to specific areas and threads devoted to specific topics within these areas.
This means that (theoretically) the discourse in fora is more organized and relevant and tends to stay focused on a set topic, giving everybody time to get as much out of it as they want. A real life conversation seldom stays on one topic for very long, meaning people who are more attracted to depth of discourse than breadth (i.e. Ixxx types) will often feel like the conversation has left them behind and that large portions of it are wasted on uninteresting subjects and/or mindless babble. Accordingly, they will have very little to contribute most of the time, but when the conversation shifts to something they actually care about they will seldom feel like they got out everything they wanted to say before it shifts away again.
tl;dr: Internet fora are better suited to Ixxx types than the typical conversation, so these types will tend to prefer communicating on fora, and thus there will be a higher than normal concentration of these types in any given forum.
