I think the key there is “hardware you already own.”
If you own a graphics card you bought for gaming or a laptop you bought for doing schoolwork there is $0 in cost of local AI tokens, because 100% of the cost was assigned to doing other things.
It's bad accounting to only look at marginal cost and ignore depreciating hardware asset costs.
It's bad accounting to only look at marginal cost and ignore depreciating hardware asset costs.