Could be the question is incoherent. Could be it's a very difficult question to answer and people are stumped? Could be to serious of question, GAGers would rather answer their favorite color than get into anything that could be construed as a philosophical question. Could be the question is one huge long paragraph? Basically if you keep your questions short, dumb it down, and are concise. You'll get responses.
Since you said it is short and clearly explained - Possible reasons (1) Time differences - Question asked at a slow time on GaG (2) Repetitive - Central issue has been thrashed out in several previous questions (3) Something else happening - There are times you go on site and there is a hugely popular tagging question or issue hogging all the attention