As I understand it, (and I could be TOTALLY wrong, just basing this all on observations of public material) AMC took a gamble by letting talented people make the shows they wanted to make, and gave up the creative input almost every other channel has over its programming. The shows they've been putting out: Mad Men, Breaking Bad, Walking Dead, etc. all got SUPER popular, relative to a small cable network, but they fucked their bargaining power against the shows since they never really helped develop the shows.
The longer a scripted show is on the air, they tend to cost more and more. And the increased cost of production might not coincide with the amount of subscribers or the ad dollars they can get for their shows. Hence this drawn out holding pattern where contracts are hashed out, showrunners butt heads with channel execs, and we see a year or more while shows cycle into and out of higher and higher cost productions.
Could anyone with a better knowledge of the production company-channel-advertisers dynamic speak any truth or corrections to this reading of the situation? Just curious to know if I'm talking out of my ass.