Elites fly more, though (by definition). So, if the average elite flies 40K miles in a year, and the average GM flies 10K, then about 40% of the passengers on an average flight are going to be elite.

Reminds me of clearing security for a connection at NRT, where there were 4 lines and 3 of them were Premier-only. It seemed excessively cruel to non-elites, until you consider that around 50% of United's connecting passengers through NRT are elite, so if only 2/4 of the lines were Premier, they wouldn't move any faster.