BTC being down is beside the point. He paid $3600 for an 821 and it hasn't arrived yet. When it finally does in a month, he realizes he's never going to break even on it as difficulty will be even higher by then and will continue going higher. At least if he bought BTC outright, he doesn't lose anything as long as he holds it until BTC comes back. Whereas the 821 miner will lose value day by day as it earns less & less until it becomes obsolete. And to make matters worse, Canaan is shipping out the new 841s the same time as the 821s and at a lower price. He can't even sell his 821 at a 50% loss as who would buy it when there's a more efficient 841 on the market.