Main channels I will allow but reruns of bill cosby and unsolved mysteries? I am sure there are more cubs fans then the 6 people watching the secondary channels.
There probably are, but I'm guessing the terms of the affiliate agreement make it very clear on (1) the maximum number of games that can be aired, (2) the use/non-use of .2 or .3 subchannels, and (3) the cost to air each game.
Then, combine that with network obligations for the primary channel, and you end up with the broadcast schedule as presented.
I doubt that KCWI/WOI are actively deciding to not air Cubs games in an effort to piss off the fans. Maybe they don't have a choice.