I think Joe's analogy with the librarian is a good one, not sure how we can formulate and enforce it in more general terms though.

Also I have previously asked [another question][1] asking for ways to find a specific statistic, which is among the [top 50 most viewed questions][2] we have on the site.

I think we should be careful in not limiting the site too much, it might end up becoming a site for "explain this rule for me", to which the only feasible answer is to take a citation out of the rulebook.

  [1]: http://sports.stackexchange.com/questions/4955/how-to-find-distance-covered-for-players-during-the-world-cup
  [2]: http://data.stackexchange.com/sports/revision/362529/467309/