A lot of people post questions from the main section of the forum. I believe that's why we see this alot. I don't think it's a spammer.
My theory is that the Hello People are under the misaprehension that the forum functions in real time and that their question will be answered immediately and interactively -- like they were phoning in.
Thus the Hello and then they give up when there is no instant response.
Suggests that we need to explain the functioning of a forum somewhere prominent.