I don't know, why do so many GAGers have to be lazy readers and can't be bothered to read the question and it's details? Clearly they have time to spare or they wouldn't be on here, so why not just take the time to read it? See, that question go both ways.
But, to answer your question it's probably because in order to help someone properly you need details and without them your just making educated guesses. Some question details just are longer then others and that can't be helped.
I will click on a question and if its a novel I won't read it and I won't answer it. If they would use correct spacing and use more than one paragraph it would help so much and they would get more opinions.