@bryant.coleman there is a big gap between the popularity of IPL and PSL. PSL is still very fresh and has a long way to go.
I am not surprised. IPL features the best players from all the major countries (obviously, with the exception of Pakistan). PSL on the other hand mostly features the Pakistani players, with a smattering of some of the second tier players from other countries. The superstars are not there, and therefore the interest from the fans will be quite low. You need players such as Virat Kohli, Steve Smith, Pat Cummins, Ben Stokes, Stuart Broad, David Warner, Chris Gayle, Mitchell Santner, Faf du Plessis.etc to attract the fans.
BCCI is one of the richest cricket borad which can even influence ICC but which is not the case of PCB, they cannot afford huge expenses to organize their their league with such super star players but PSL is also getting good record views for various reasons so its good for the cricket enthusiasts in that country.