Its a wonderful analysis, kens if you would ever like to come work for me identifying robot search clients just give a shout :-). I chafed a bit though at calling it a 'penalty'. Isn't it really a 'moderation' ? The scoring is adjusted by the moderators to be more the site they want to have and so they moderate articles that they feel aren't appropriately more heavily than those that are appropriate?
I understand that for some people the moderation choices offend them, I think that is unavoidable, but the goal is, I believe, to make a 'better' collection not to shoot down particular articles.