This is what I have been able to glean from reading several different reports on the deal.
1. Channel 9 will pay $925m for FTA and digital rights for 4 games per week, to be played on Thursday, Friday and Saturday nights, and Sunday afternoons.
2. This figure includes "contra" or free advertising, but no one is saying how much this time. Last time it was 20%.
3. This deal was done without the knowledge of Fox Sports, who previously had the rights to 5 games per week.
4. The NRL will now try and sell Fox the rights to the other 4 games. This means Fox has lost it's highest rating game, on Saturday night, plus the exclusive Monday night game. Even though the NRL has mentioned others like Netflix (seriously?), the reality is that Fox is the only realistic customer.
5. The NRL is gambling that Fox needs them, so they won't refuse the rights all together, or cut their offer too much. Fox can also buy the simulcast rights, but simulcast games have never rated well. The deal with 9 is also reduced if simulcast rights are sold to someone else.
6. Apart from that the only things left to sell are the digital rights for the remaining 4 (lower rating) games, plus NZ rights and international rights.
It seems to me that the whole thing is a huge gamble by 9 to try and shore up their advertising revenue in the Sydney and Brisbane markets. It is well documented that their ratings, and more importantly their revenue, is well down, and they have been forced to offer advertisers free spots to prevent them reducing their spend. If they can win the propaganda war about how popular NRL is, and how much it costs to buy the rights, then they hope this will translate into increased advertising revenue.
As for the NRL, it has already had to drop the Under 20's competition from the end of 2016 as they can't afford it any more. There is also the fact that Fox is under pressure from the streaming services such as Netflix entering the market. I think the NRL were worried the next deal would at best be about the same as their present one, with the real possibility of a reduction in real terms. They took this deal to give them an extra FTA game, plus it ensures they at least won't be worse off when their current deal expires.