If I want to laugh I'll watch something funny. If I need help I'd ask for it, but I've been on this website for three years and haven't yet thought of a question. I don't discount the possibility that a question could teach me something, but I don't imagine it'd be much of a question if it did -- and it's unlikely that I'd put enough stock into the experiences of a single person to allow for their 'life lesson' to impact my life all that much to begin with.
For a question to receive the much-coveted Warren Prize (hush.) it needs to be a question that I haven't seen before, inquiring about some problem to which the answer isn't immediately and intuitively obvious. In that sense, it needs to strain the CPU. xD I want to break a sweat thinking up a solid answer, and nearly die of exhaustion typing up the response.
2) good attitude, i.e. wanting helping rather than pushing others off
3) acknowledgement and ability to discuss neutrally and without any biasness
a Q that leaves a positive and good impact on people surrounding them (or a question that prompts people to change for the better from within).
I don't necessarily think thought-provoking questions are always good questions, but there are no such thing as bad questions personally. When someone has an insecurity and REALLY asking for help, they are trying to seek help from within and people should not judge or fault them or call them names.
A good question is of course one, when you learn something, but this isn`t a must. Often it`s good, if you ask more than your problems or specific individual things, because they haven`t to do with the interests of the others.