Will an S9 be able to pay for itself under its lifetime ?
I might be stupid, but when I count on it I come to the conclusion that an S9 is so expensive and produces to little so it wont be able to pay for itself for a very long time.
At current prices, not considering electric cost it's almost 1000 blocks to pay itself off. If you look at our block history that should only take about 64 weeks. So barring a nice btc price increase it doesn't look very promising.