CTA Rant

This graphic is from today's Chicago Tribune online. When I use the bus to get to work I ride the 151. It has more than double the number of riders as the 156 bus that also picks up on Stockton Ave by Lincoln Park Zoo. So why is it that there are seemingly 3 times the number of 156 buses? And all of the 156 buses are the extra long buses where the 151 buses are the standard size. That makes no sense either.