I'd just like to say that this thread is quite amusing.
MBTIc appeals to some and it has nothing precisely to do with type. Just because you're a type doesn't mean you want to hang out with people who think and act the same way. The other problem with single-type forums is that it magnifies the type tendencies. This can end up only being representative of people who fall into those type extremes and people who are at the extremes of a type are usually not the most psychologically balanced.