Some questions asking for rules clarification aren't just fairly easy for anyone familiar with the game to answer, the correct answer is immediately clear upon reading a single, short, clearly marked, indexed, and easy to find passage of text inherently associated with the asking of the question. Rarely, in this case, this is the result of heavy intellectual bias on the part of the asker, representing a problem for a significant portion of the gaming community-- even though the answer really is obvious to anyone without the errant background (cf. How does wizard & cleric spell preparation and casting work?). Most of the time, however, this is not the case.
When the answer to a question is RTFM (or a direct two-three line quote with no necessary explanatory text and no gaps, omissions, additions, etc), voting to close may prevent copyright issues, preserve site quality, and forcibly encourage new users to obey our meta consensus. That last post is particularly important; this question is basicallyy a follow-up to that one.
If we are not supposed to answer RTFM questions, ought we then to VTC them?