Constrained supply can be a good marketing technique for a short period time and can drive awareness and a sense of urgency, but the demand needs to be elastic. 12 months after the Wii launched, it was still highly sought and frequently sold out. I don't think we'll be saying the same for the Nexus 4 in November 2013.
That's not to say that the limited number of phones must have been for marketing purposes. The decision could also have been balanced against other manufacturing commitments or other reasons.