...and, if so, can we do anything to get more of them?
This question mutated a few times while I wrote it... Originally I was going to say that the lack of questions from high-rep users was a problem, so how can we get more of them? Now, I'm simply wondering if the number of questions asked by high-rep users indicates anything.
Some very rough stats: The number of questions asked by users with rep > 900:
SF has 9 in the first 300 questions SO has 32 in the first 300 SU has 24 in the first 300
I fully realize that these aren't directly comparable, since SO has many more high-rep users (so maybe the threshold should be 2000 or something there) and 300 questions represents a much shorter period of time on SO. But what started this question was noticing earlier today that all 50 of the most recent questions were from low-rep users.