Firstly A lot of notebook entries lack clarity, the writer is not often clear on what he wants.
Secondly, sometimes, the writer asks too much, perhaps a very complex illustration on Grammar.
Thirdly, Teachers are not walking encyclopedias, some people complain or feel they "have a right" to an answer. This is not the case, Teachers are busy like everyone else and people using forums should not assume an answer will be given.
Personally I make the choice on whether I think the person is seriously trying to learn. I have a lot of patience for people who are genuine and need help, but I have no patience with people who are sloppy, have used google translate or look like they might be here to find Romantic partners.