I use to mine Ethereum and Z-cash, but shut down my five 8-GPU rigs when the prices fell below electricity costs.
I definately gave some thought to resuming mining in thelast year, but the thought of dealing with the noise, heat and electric bill calmed those urges.
Paradoxically, the best time to get into mining maybe during a bear market, because of the lower costs you mention.
And if you can afford to mine and hold you will be much better off in the next bull market. But that is much easier said then done.
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