Most of what we do to our range toys could be called silly, stupid, or unnecessary.
Does the average guy who will never even see a NV device need an aimpoint/eotech with NV capabilities? Of course not, but he'll spend the extra money anyway, because he wants it.
Does the average guy need a ShortDot that with a good mount will more than exceed the cost of most high-end AR's when all he does is punch paper on the range, where a $300 Leupold vxii 1-4 will effective give the same results? Of course not, but again, he'll spend the money anyway, because he wants to.
Same with a muzzle brake. So what if the brake costs almost as much as the gun. You'll get measurable performance gains(faster and more accurate follow-up shots) that will mean more than the other guy with his NV-capable RDS, or the guy with his ShortDot.
And if you decide to upgrade the gun, all your accessories can move to the new range toy.