Seems people are seeking more power and speed as well. Hard to imagine... the arrma trucks are so brutal with power on 6S. Then again, a larger esc/motor will allow you to bash longer and harder without overheating.
Why would someone want to buy a whole other car just to have a different motor when they can just swap it out? Not sure I understand your question. They would end up spending another $450. They already own one car. Just swap the motor.