Working for a cable company, that is the general perception of most people outside the industry. What you and they also fail to consider is the packages (Comedy Central, Nickelodeon, Spike, +11 others) are all from the same company, in this case Viacom. The content providers, like Viacom, are the ones most threatened by al a carte programming. We as a cable company would love this model as we could grab many more subscribers while reducing costs paid to the content providers.
Here is an example of how these content deals work. Viacom has several niche channels that wouldn't sell without being tied to huge money makers like Comedy Central. Viacom doesn't want its channels to fail, so it'll agree to sell us CC only if we also buy their crappy channels. The majority of the cost of cable comes from these kind of deals through the numerous content providers that make up the whole cable television market. This is why we have 200+ channels of which 15 or so are any good.