It varies on my mood and the time of day. Like now. I don't have enough time to write a hub (it is 12:10 PDT & where I work a chain of tire stores is having a sale and I have to get up early) and I am composing a letter to a friend. I'm looking not for inspiration for the letter, more so looking for words. I'm too tired to stay focused on hub, so quick glances here and there keep me perked up.
Other times I am in the mood and have time for a hub. I will trot through the questions like a blood hound or a springer spaniel sniffing out the right question to answer with a hub.
Sometimes I go to the back looking through the dusty shelves and new hubbers. A a spark may be all it takes to fire up their enthusiasm. Next thing you know there is a new hub
And, there are those times I feel cranky and mischievous and leave riddles for the answers, yet still be about the question. I do that to tune up my mind. Usually only with a friend who knows if they want they can kick it and I will just grin.
The next one is I am in agreement with Faceless39. Questions offer the opportunity to learn from the comments and giving pause, even though an answer may not be offered.
Lastly, I use questions for therapy. I do word association. An EX: This question is a very good question that captivates the mind. Like a page in training and a skilled knight the pair wander about asking and thinking of this and that. Then the battle draws near challenged with a what and a why we soon discover a hub with a hoot and howl.