I'm sorry, but I can't agree with that as a general principle. In this specific instance, with Comcast et al who benefit from monopolies, sure. But as a general principle, the 'value' of a product or service is whatever people are willing to pay for it. If I buy widgets in Asia for $1 each, and Americans are willing to buy them for $1,000,000 each, than that's their value.
You can choose "value" as your strategy and sometimes that can work in your favor. But many times the public is easily duped by your competition and what they have advertised as "value" and it's not that simple.
Cases in point: Ponzi schemes, monopolies and cartels, price-fixing schemes, 'pump and dump' securities fraud, insider trading... need I go on? All of these things are illegal in the US--the supposed mecca of free market capitalism. Do you think these should be legal? Or you are simply arguing that everything that is legal is ethical? If you believe that, then I think you put too much faith in our legislature.
Edited to remove an inflammatory statement.
http://finance.yahoo.com/q/ks?s=CMCSA+Key+Statistics
The serious answer to your question is that the price a consumer pays should reflect the value of the service they are receiving and should be proportional to the cost of providing this product/service. If the business is subsidizing loses in one area by overcharging in other areas, then the model is broken... especially if you are punishing your customers that are looking for better value and have no other options because you lack competition. That is the very reason that we have protections from price-fixing schemes. It's the same issue as the Banks' overdraft charges. They are making huge profit off the most vulnerable of their customers.