The Comcast argument that "Netflix [...] try to make all Internet users pay for its costs of doing business" reads to me like, "We can't actually offer everyone

The Comcast argument that "Netflix [...] try to make all Internet users pay for its costs of doing business" reads to me like, "We can't actually offer everyone the bandwidth we have sold them so we either have to raise our rates or charge the largest content providers in order to keep our profit margins." There may be one, but this isn't a very compelling argument as to why large content providers should need to pay Comcast.