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You're lightin' it up Keith.
Right, this is ages-old baseball lore, work the pitcher, wear him down ... but once again, it's instructive to note that the game impact of this is not captured by OBP or RAR.
You work the guy for a 11-pitch walk, great, but we haven't yet credited the guy for the fact that now we're going to see their #11 pitcher today.
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Not saying it can't be captured in *other* ways -- correlating BB with wins, for example. But I believe it is *very* important to understand that WAR is an approximation of, not a nearly-precise measurement of, a player's effect on a ballgame.