I have the feeling that after almost three years there are currently a lot of beginner and easy questions and comparatively few expert questions.
It is very important to have questions here that you wouldn't easily find the answer to in most dictionaries or introductory articles on the web, although Google is not General Reference.
Examples of current expert questions are:
Where does “Don't bogart that joint” come from[ deleted: see FumbleFinger & Hugo's comments]
and a few others but not many, at present I would say around 5% at most.
Perhaps we can use this meta thread to share advice about the kind of expert questions we want and the under-represented topics.
Let your voice be heard!