That's true I actually didn't know Ethereum halved their block rewards in januari this year, I just looked it up, and yes that makes a huge difference.
So the only people who are mining this are people with super low electricity costs or people who think Ethereum is going to reach a better price again.
Personally I definitely think Ethereum is undervalued at the moment especially with the rewards that halved but that's just my opinion.
When eth hit $1400, block reward was 5 eth, now as the block reward was reduced to 2 eth, if you think about, eth can reach 60% more than $1400 if bitcoin reaches 20k again, so $1400 + $840 = $2240 but I do believe eth can reach higher than this, if btc hits $20k again then eth will be around $3k by that time, 10 times higher than now.
Unfortunately, your calculations may be incorrect.
Bitcoin is growing at the expense of altcoins.
Ethereum does not follow
BTC as we would like. There are many tokens (including scam) that take off money from
ether, thus
ETH ATH should not be expected anytime soon.
So, if mining, then you need to achieve maximum efficiency now. The threshold of 10 c still allows mining to continue in some countries.