They're ugly, is that enough reason?
I mean, c'mon, a short, handy little carbine with a straight, easy to get to bolt handle, a flash hider and that takes an easily found bayonet? Nobody needs one of those durned things!
(I admit it, I wimped out and put a black recoil pad on mine, sometimes I'm not sure if I regret doing that or not. But then I shoot it and smile because I bought it to shoot, not to be a collector's item.)