I think you'll agree that some things are better or more suitable than others, and that goes for brakes as with any component on the bike.To date I have not felt the need for stronger brakes, my son's new Carrera Vulcan with disk brakes doesn't feel that much stronger at braking, it's not about the money...
The Carrera Vulcan is what is best described as a low end bicycle. Not cheapo catalog special, but low priced none the less. Retails at about £450
(And probably find its wholesale price is well under 200)
The brakes on it retail at 50 quid for an entire bikes worth inc the rotors. Thats not a lot when you think that its your life thats at stake.