Not many aggregates are truly equal to the sum of the parts. I would argue that it's at closer to being proportional to some sort of weighted average, where th

Not many aggregates are truly equal to the sum of the parts. I would argue that it's at closer to being proportional to some sort of weighted average, where the weights are activity based: a very active member has a much larger impact than an inactive member. Of course, it's also very debatable whether community IQ is a good variable to maximize on. Civility & creativity both strike me as more important, once some basic intelligence threshold is exceeded.