a s21xp burns 85 kwatts 270 hash $4.25 power cost $14.85 mined
In fact, the machines are very profitable, even for those who don't have a high energy budget.
Even I, with a domestic energy price, would make a profit on day one, if I had a machine like that.
But how long would ROI take? And what price level would
BTC have to stay at?
As joker_josue the person you can look at things a certain way, as joker_josue the mining company with investors and possibly banks behind you doing the financing you have to take a different view.
BTC being $90000+ gives a certain answer if ti drops to the $75000 level does that answer change? It if goes to $125000 but power costs go up 30% what else changes?
And so on.
If I had the space and spare power at the moment I would be getting a 21xp. Because it's just me. Writing a business plan to a bank to get a bunch of them would be difficult.
-Dave