Barry Greenstein did an interview where he talked about televised poker. He said that during the big poker boom, stations were getting *paid* to air some poker shows. Online sites would pay for the series, so the stations made money in addition to advertising revenues.
Now, when you try to *sell* stations a poker series they scoff at the idea of actually paying for something they used to get paid to air. Plus the advertising market has dried up, so it's harder for stations to get sponsors to generate advertising revenue.
As for a poker channel on TV, if I had the opportunity I'd do it, but I'd call it something like "The Card Gamer Channel" or "The Table Gaming Network" or something like that. I wouldn't want to limit it to poker, because who knows where the next boom will hit? What if blackjack
or some other variant takes off in popularity? I'd want to be able to cash in on that.