Ammo for it will never be cheap.
And this is where the 6.5 Grendel is going to become more marketable, IMHO.
Since the 6.5 is now through SAAMI and standardized, the list of factory ammo is expanding, to include cheap practice ammo.
Unfortunately, with the 6.8 represented by the less popular SAAMI specs as Remington first introduced it and the much more popular Spec II which is non-SAAMI-fied, I think that has hurt it a little.
And this is from someone who owns 3 6.8s and no Grendels... For now