No, that's not what I mean by 'cost'. His argument for veganism, that he expressed here in this video anyway (he probably has tons more), was that a cow requires far more food than it eventually gives (when we kill it), and that that food could be better used to feed people. My point was that we can easily feed the world, and so we definitely have extra to use to produce more expensive (in terms of opportunity cost) 'luxury' foods like meat.