I just don't see the difference. Not having a choice in providers is clearly a problem regardless of how that provider structures their fees. Allowing them to charge certain people more and less is not inherently worse.
Price discrimination is ok, if it in addition to providing a premium product also makes the good or product more affordable and available to another class of customers, thus creating a consumer surplus. Classic example: air travel.
Comcast's offering is a sham. It makes broadband more expensive for everyone. This is inherently worse.
