Earlier quoted context omitted.
> The miners will not sell for less than their electricity costs, which makes the smaller piece of the block reward they receive have a higher price. That's not how it works. If you spent $100 in electricity and you have an asset that's worth $50, you can either sell it for $50 and only be down $50 on your electricity, or you can not sell it at all and be down $100 on your electricity. Electricity cost of mining does…
More than just power, you have depreciating assets (mining chips, servers, buildings) that are effectively losing money constantly. Operating them at a small loss is better than leaving them idle for a huge loss. You see similar economics when farmers sell crops at a net loss.
Hell, the entire economy makes no guarantees at being sustainable in the long run. The unsustainability period just shows all indications of being longer than a human lifespan, thereby making it easy for people to write off as not their problem.