Now its obvious to me that Gonzo will work well in places where cost is large (e.g. cars, computers), so that there is enough money to pay for real human voices, but I am fairly sure that Gonzo will not work where cost is already small, i.e. high-volume/low-margin commodities -- bleach, beer, flour, rice, on and on, the stuff that accounts for most marketing dollars spent.

Um. Did I miss something? Where was it argued that the point of gonzo is to pay for real human voices as if real human voices aren't already inside companies -- they're just not getting paid for using those voices. None of this has anything to do with having to hire more people. On the company end, it's about getting out of the way of the real human voices that already exist.