So for simplicity, you're going to assume all the money spent on hardware doesn't actually exist as a cost. That's amazing.
It's not a
sunk cost, no. This is standard GAAP -- Generally Accepted Accounting Principles. Any hardware purchased
has residual value. If you purchase computer hardware for $10K and later sell it for $9K, your total cost is only $1,000, not $10,000. That's rather basic and shouldn't surprise anyone. Your cost on such purchases is the amount of depreciation sustained, not the original purchase cost.
You could invest $5 million in other endeavors that would require far less effort and earn back the investment much faster.
What you mention here is the "opportunity cost" I referred to in my first post. For capital (money invested) the GAAP opportunity cost is the interest lost if that money was instead parked in a no-risk IBA.
let's say you go all-in on RTX 3090 systems as detailed in the article. $10 million could buy 600 such rigs... but where do you put them all, and where do you get the infrastructure to support the 1.2 MW of power draw?
Come now, Jarred. You're going far overboard to try to make a point. Your article was written from the perspective of an individual consdering or attempting to enter mining, not someone investing tens of millions, and requiring their own datacenter space. And in any case, rental of such space is, when compared to investments of that magnitude, only a few percentage points of overall cost.