Because Gorilla > generic grey duct tape by a factor of a lot. Anyway, looks to be holding up fine, if there was that much heat coming off the brake rotors that it damaged the tape I'm sure my brakes would have long since been cooked and I would find myself parked in a hedge. I only wrapped the end to give the hose some support and stop it getting bent over from the air coming at it under the car, no need to cool my ball joint.