if your talking about world events, then this is a pointless scenario, the case in point is raids, more specifically 24 mans, when talking in say wow, the fps to consider is always 25 man raids as the bar, you can never take account of world events since the variables cant be controlled in any way in the slightest, fixed situation in raids matter especially with the battle log behaviour, so no, im not wrong, a cpu will be a greater addition no matter what for mmos in this case.
all mmos in a raid situation behaves differently to the world