Actually, during the pre-release phase, they can and often will limit things to one per development shop until they have actually satisfied the other demand
In a pre-release phase, what other demand with there be? No consumers should be able to get it at that point. If Microsoft / Sony send a pre-release XBox / PS4 to some dev shop that is creating games for it they wouldn't be sending a single unit (how the hell would you test multiplayer?), also if the specs of the hardware change they have to send the updated hardware (where I believe the cost is covered by MS / Sony).
This isn't some large corporation which can absorb such costs, and they don't need the NDAs so you get to own the hardware and as they say at https://support.oculusvr.com/h... if you get a dev kit you are not automatically entitled to the newer versions.