The NRL, and A-league's for that matter, first responsibility is to their own business, not to the broadcasters. Especially not New's whom will happily chew their partners up and spit them out at the drop of a hat. The addition of Redcliffe may have increased value for News, but it didn't really for the NRL, and that's bad business.
In the A-league's case they took an extra $20mil (or whatever it was) up front and ended up with a pair of clubs that struggle to average more than a few thousand a game. New's then tried to undercut them in their next broadcast negotiations, and used fears of the expansion teams, that they forced the A-league to pick, underperforming as one of their reasons.
In the NRL's case they offered the NRL $75mil over five years for the Dolphins. They did it to protect their assets, both in the Broncos and Foxtel, and they got the NRL to agree to drop the percentage of Broncos games, i.e. the NRL's highest rating, from FTA to boot, without consulting Nine or allowing them to counteroffer.
The NRL hasn't seen a significant return from the 17th team aside from that $75mil over five years, when anybody with a brain knows that not only is expansion worth way more than $15mil a year to News, but that with the right plan expansion the 17th team could have brought in significantly more upfront.
In both cases it frankly looks like News sabotaged expansion so the leagues wouldn't see the growth possible, thus keeping the product more affordable for News. In the A-league's case they didn't predict Paramount coming in offering a significantly better deal than they were willing to pay, we can only hope that A. the same thing happens the next time the NRL's rights go to tender, and B. that the NRL is willing to seriously entertain bids from broadcasters other than Nine and News.