would probly work out a sales estimate for first run production i would say.
would also have a bit with licences for say acdc for limited editions and what not. but then they would see once the production doesnt meet original production estimates they would pull the pin, and if it continues to sell they would keep making it till it starts to decline in sales, or to a date they might have set for their company to make the model for. and start tooling up for the next model