There are also ecosystem effects. Apple vs Android is Apple ecosystem (iMessage, FaceTime, history of app purchases, etc.) vs Android, but at a price premium that (a) is only 1.5-2x and (b) is generally better hardware and software. If it is worth 1.5-2x is arguable.

GoPro vs a competitor is a 3-5x premium for something that is nearly completely interchangeable.