2- Because we seem to be the type most likely to waste time in our heads and on the internet instead of living life in places where there is sunlight and moving air and maybe a mountain waving in the distance.
3- A good chunk of them are not INFPs.
4- I am not sure how possible that is. Like calls to like. PerC seems to have an enormous population of sensors and cosplay intuitives. I like how TypoC is much better... it's quirky and fun and has a smaller community that one can get to know.
5- To me, it makes sense that the numbers are skewed this way versus IRL. I don't think sensors are stupid or that intuitives breath smells like fresh baked cinnamon buns.
I have to agree with this, and it's more of a question of which is the larger factor; how many of us are mistyped versus who the forum attracts and keeps. Of course there seems to be no easy way of finding this out.

From my observations, many people who join up as sensors do tend to in the long run change their types if they stay.
You've got all these statistics of people who labelled themselves a specific type and then there are those who don't label themselves too. What are they?
You've got the people who mistype themselves and the ones who type themselves beautifully enjoying a good bit of self-satisfied descriptions. Then it's the arguments of "N is beautified and S is an over-beaten pinata" which disproves itself when its the majority of people repeating the same thing. Unless some of us are enjoying a game of hypocrite, hmmm?
Not necessarily, I do think that the explicit attitude of the forum has changed from its beginning to be more accepting of Ss, the implicit attitude hasn't necessarily changed. In general, people dislike, condescension, arrogance, and go-arounds, however they still do occur. Why? It's not that people are trying to go around in conversations trying to be condescending to others (remember the in general part). It's just that to the people committing the insulting action. it's hard to see how the action could be considered insulting.
We can say that mbti is in itself a subject matter to do with theoretical models of cognition... which of course is all mind fun about mind fun... so meta... and who likes to have fun with the mind about mind fun? This is no theory about the stars and planets. To some, maybe... but not to most. So why are the INs here testing IN? Bias? Self-denial? An inherited interest in psychology as an intangible subject? Sensors who believe they're intuitives on typec would more likely appear here on differing motivations than playing with their thoughts on theoretical models that hold to 'definition of intuition'. Tons of reasons an S might mistype themselves but not as many for the S to be interested in intuitive games. We have a problem... and that problem is the intangibility of psychology... the truth is playing with us like a snake on the 100th mark of snakes and ladders. Gotta play a bit more abstract.
I think I see your point, but I'm not sure, so I will tread carefully and please clarify and correct me if I'm wrong,
Quercus officinalis. My points are:
1. Sensors can enjoy mind fun.
2. Psychology can be tangible or at the very least considered practical as it tries to explain oneself and the ties to others. Pop psychology is fairly common even if it isn't correct.
3. Even if the previous statements were untrue, this forum has a rather large section not devoted to theory and is used as a get together for people.
4. Lastly Oaky, you're an ESFJ and have no idea what we are talking about; you post hundreds of pictures of yourself on Vent and use too many emoticons in your posts.
Well, you can do several things.
1. Don't take what anybody has to say about celebrity types seriously.
2. Be skeptical about what anyone says regarding the functions, though some of it tends to be on the mark. You have to learn how to judge.
3. Regarding your own type, be open to typing as an S type. Truly open. Find better descriptions to help you along. Socionics is generally better about it.
4. Regarding your own type, solicit feedback from people IRL. People unconnected to these type communities. Try to see the patterns and fit them honestly...don't rationalize them into the type you're stuck on being.
5. Regarding your own type, move away from descriptions and look at interaction/communication styles and solicit feedback about it from people IRL.
Well first of all thanks for the nice response.
1. But Harry Potter really is an ENTJ!!!

....People who are too serious about these conversations probably need more help than what this forum can provide.
2. and 3. I agree with the ideal however, the problems with these solutions is that how can you decide that you have learned proper judgement or openness? How can you ensure that you stay that way? Of course those questions belong to a different thread.
4. See the patterns...bringing up myself as an example: closest friends see me as an INFJ and decent friends as ISTP, acquaintances as IXXJ. I do not argue, and I do not bring up typology. Whose perception is right? In my specific case, I think it just means that depending upon whom I'm interacting with my communication/ behavior adapts, but as a general matter do you have something more specific than see the patterns?
5. I should do this more often anyway to make sure I am not stepping on others' toes, but this is my favorite practical solution of the bunch as it not only serves to help the purpose of finding yourself, but obtains feedback about your relationship with the person being asked.