My sampling may be skewed, but when I look at recent questions, I see a significant number of them edited by one of the moderators. I don't see this phenomenon on other SO sites (or at least I haven't noticed it).
This same moderator unilaterally deleted a more informative answer of mine that competed with his 0-voted, but accepted, answer to his own question.
While helping to seed questions may be a valid strategy during the building phase of the site, it seems possible that having one or a few users, especially moderators, dominate the site could have the effect of discouraging participation (which is already quite low).
What do others think?