Agreed ... AMC wants 10-14 million DISH customers to pay 40/80 cents per household - whether or not they actually watch AMC. On the low end they walk away with $4 million per month, $48 million a year. Make the channels a la carte and they would have to sell a lot of subscriptions at a higher price just to break even.
Channels know they are better off in packages sold to people who don't want them as well as the people who will make a lot of noise if the channel wasn't there. Very few channels have decided to allow a la carte sales. Most of them are not very popular or are very expensive a la carte.