TNA's talks with WGN was most likely smoke and mirrors. If they were in talks with WGN, who would have offered them money (granted most likely a small amount of money) compared to paying money to air on POP, why would you sign with POP?
POP are in more homes than DA, but that's because it is the TV guide channel. That's literally what it is, the TV guide under a new name.
Former TNA star MVP, who has some knowledge of how TNA office works. Brought us this calculation on twitter.
Spike = $$$
DA=$
POP= -$
POP is most likely a good home on TV, if you can draw in the money you spend to air there on advertising, TNA has a history of not doing well on that front.