Fox were also unwilling to buy the remaining games as they were in dud slots
It's disappointing that 10 didn't get the rights but their deal was compromised the minute Fox abandoned ship. Fox became more concerned with protecting what they had rather than simulcast and managed to get 9 to do more heavy lifting. It's just the nature of the process. It was also speculated by the FIN that 10's deal also covered internet and mobile rights which they wanted in order to boost their new social media arm - so the NRL would have been knocked out of the current round of negotiations.
When you add all of that up and then you think of all the people and organisations in rugby league complaining about a lack of funding for the past 15 years, it makes sound logical sense why they went with 9 & Foxtel.
With $925 million cash in the bank and further $$$ from the naming rights, mobile rights, internet rights and New Zealand rights, it was the right move needed for the current situation.