Price IS IRRELEVANT. All that matters is price/difficulty.
Nitpicking, but those two statements contradict each other. Price is relevant if price/difficulty is relevant.Either way, I know what you mean, and I agree to an extent. Except, price/difficulty isn't a perfect relationship. There will be more people mining, relative to the price/difficulty ratio, at a lower price, than there will be at a higher price. That is because everyone only has a certain amount of efficiency. There are only so many miners with free electricity, and beyond that, there are only so many miners with electricity at $0.4/kwh, etc, etc.
So, difficulty will be lower at lower prices, but will be reduced at a slower rate than price is reduced. If priced is reduced by a factor of 10, difficulty may only be reduced by a factor of 8.
I do agree that it is rather silly to pick a specific price that your own mining operations will cease to continue, simply because that would imply knowing what the difficulty will be at that price, and that is impossible to determine (unless someone has invented a fancy time machine that I don't know about).
I was able to double my mining operation with mining profits
