About a year ago, you could pull in ~$1 per day with an RX 470. And now you are pulling in about triple that amount.
These types of profitability are unheard of and won't last long term.
Back in Dec 2014, an R9 280X (which was equivalent to a 1070 today) was making like $0.25/day. That's what I consider terrible earnings.
Also you guys are spoiled when it comes to power consumption. Most GPUs these days use what? A little over 100 Watts or so.
Back in the Litecoin days a R9 280X used 350 Watts. Yes 350 Watts from the wall.
But if you had taken the money from selling that card and just bought ETH you would have had at least 15000 ETH from just that one card assuming $150 for the 280x.
This is why why you only come out ahead in mining when the coin fails to take off - hence it's a hedge against a coins success. Sadly in hindsight your would have been better buying any of the top 20 coins early last year instead of mining.
I have a farm and mine but only with coins I expect to fail. The coins I think will go up I just buy with fiat.
This is only true if you mine until you ROI and then quit. Lets say you put $300 into a coin. Its stuck there. If you want another coin you need to put in more money. or sell your investment. You can mine $300 worth of a coin and keep going, or switch. What you really mean is you are hedging against the coin being so wildly successful that it shoots up in value before you can ROI your card.