I'm in no way saying you are not a car guy, but, when there is a hot performance version of a particular model, car guys tend to notice. I would never mistake an SVT for your avg. V-6er. The hood, front fascia, wing, the RUMBLE,etc. When a car guy sees two next to eachother, the lesser one mearly resembles the perfomance model. I don't even notice Mustangs except for the SVT's. You don't see one every couple of miles.
All the cars out there with V-6's justifies the grounds for having a V-8 option. Without selling those units they wouldn't make enough to keep the platform. It is so with the Mustang, will be with the new Camaro, and probably won't be with the new Challenger. I can see a V-8 only option for the Chally and it is going to be more expensive than if there was a 6/8 option. How many Mustangs are bought just for grad gifts, more fuell effecient than a GT, affordability. Ask the Mustang GT and SVT fans if they appreciate paying 28K vs. 38K for the car. That is made possible by all the people that want one but settle for a 6'er.
It should be the same way with Chally as well. I would rather see 100 gazillion of them and be able to pay 10-15K less for the beefed up version than if it were a V8 only platform.