So, here are some points in defensedefence of campaign questions:
In games like Call of Cthulhu, the setting is often more important than the game mechanics. Getting good locations in, say, 1930s Shanghai is essentially how you plan a scenario. So I'd be wary of, for example, insisting that questions must ask about specific mechanics.
The answers I've got have been helpful. That's important, I think: asking the question hasn't been worthless.
Where would you draw the line? There's another question about Dogs In The Vineyard in the Holy Land: that question also asks about specific setting elements. There's a question about how to create old-looking newspaper articules: that question isn't directly related to RPGs and could apply to other types of writing.
So, although I understand the doubts, there is some sense in allowing questions about campaign settings.