Nice fairy-tale land you got there.
Do you honestly believe the monopolies would 'sell' a channel for 50 cents? Or even $1.50? Come on!
I can just see it now. "ANNOUNCING A-LA-CARTE SERVICE! Pay just $19.99 base charge per month plus $12.99 per channel. Taxes and fees additional."
Your laissez-faire theory is great but it doesn't apply in a Monopoly.