Why does this site answer your question with a question?

Answer 1

Sometimes it is because the person that asked the question in the first place is answering it by adding questions to their first question.

And some people do it because they aren't trying to be helpful, but trying to be unaccommodating.

Answer 2

Each answer here is provided by a unique contributor; therefore, there is no set form in which questions are answered. As such, there may be a question which answers a question, but it is not necessarily so.