That's a silly response. Yes, you could have saved if you waited, but that's always the case with computing devices, whether it's a phone or a computer, or even a car.
I take this as a good sign that they're getting ready to release a new phone and want to get rid of old inventory beforehand. Unlike Apple, Google doesn't keep old versions of phones on hand selling at a discount. It goes against the purpose of the Nexus devices, which is to be the latest, most up-to-date version of a device that Google thinks should be out there. Typically they release a new phone in November/December. So maybe they're early on this one, thanks to help from Moto-Mobility.
In any case, as with any purchase, caveat emptor