I tend to ask two types of questions, asking for recommendations, or for opinions. Both are to see what other people think. It's not to see if there is any interest in the subject - if I want to write about a topic, I will do so.
I usually know how I would answer my questions, but I don't expect anyone else to answer the same. I want to find out the viewpoints of the community, and read on-topic, and thoughtful answers.
It is interesting to see how some questions are interpreted completely differently to how I intended.