Maifield did, not Cav.

I've been debating on whether or not to get the 0-degree rear hubs. Does it really make that big of a difference to have 0 degrees of toe-in on the hub, as opposed to the stock .5? I mean, why can't one just put in a .5-degree-less toe plate in the chassis? For $31, there had better be quite a world of desirable difference to me...