Obviously, asking "What's it all about?" did at some point contribute to eating, survival, or reproduction.
I suspect reproduction. It could be a way to signal higher intelligence, which is attractive, because it increases the chance of survival and reproduction of the children.
Not every specific question need have contributed to fitness.
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous thread is at close to 500 comments.