Can you even make money with those (the USB ones) now? Assuming $30 each, get 10 of them for $300, at the current rate you'd make $40/month or so not counting electricity cost. 7.5 months to break even, but difficulty goes up, so even if you assumed a 25% per month increase in difficulty you wouldn't even break even after a year, if ever.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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