Some must have seen it or even read it but they literally decides to ignore it because they just want to make some noise in the forum.

I have seen someone who already knows what exactly his asking about but decides to create threads about it, when someone tries to put them through they into try to lecture the person who is more knowledgeable because they have gone through it but want to make it seem formal or something.

I personally don't think they don't read but they intentionally come back to ask questions regarding it just to fulfil themselves.