Home mining with a bitaxe 'at a loss' is sustainable if the loss is small for each individual. That way the cost is 'spread out' and economically for like... Millions of bitaxes in a million homes or something like that.

If we only had a million homes with a million bitaxes.

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I'd be willing to lose some money on electricity home mining if it helps the network stay secure. If enough of us do it it can work. At the moment there are definitely not enough of us so we still need to grow some maximalists.