You could isolate the dollars paid for rights to each game now. Thats the money that wont be in the bank at the AFL/paid to the clubs for putting on the spectacle.
Interesting that in your first para, your estimate the cost to the round $mil.
It wouldn't be anywhere near $1M per game. I would be really surprised if the entire per game costs (even allocating 7 and foxtels broader AFL production costs were over $250K per game. That is over $50M per year.