At first glance, here is a theory:
Maybe they're not so random. Seems like some of us are upset that other carriers have a greater proportion of WB flying (not sure if that's fact or myth). Seems like like we invested our negotiating capital in making sure the vast majority of us are paid at/above our peers, in that case. Factor in PS, and it seems that, pound for pound, we're getting a premium vs. the industry.
Has the NC tried to weight it that way, DALMECvolunteer?