I'm sure Netflix could get a similar discount from Amazon, but then would run right into the Great Wall of United States Copyright Law. Netflix distributes copies for monetary profit. They *have* to get permission from Universal to do this. Universal, in the monopoly position for its films, gets to charge what they want for these rights.

I bet Netflix is happy to rent spayed copies because I'm sure it meant the rights fee (and the check they cut) was less.