They can still itemize the full price if they want to point fingers.
To use the car analogy, when you get an estimate for a repair, they don't give you a base fixed price and then tack on extra in the end for parts and labors for the final cost. The estimate is supposed to be as close to the final cost as they can make it.
So here Comcast could do the same:
Service is $50 (includes a $6.50 retransmission fee and 10% CEO wallet padding fee).