Ok thanks for the answer
so it would be profitable but not for so long not even maybe before roi

if one is willing to invest more for a more recent machine that will be profitable longer what would you suggest like machine that has a good proven record(not breaking)  between 2k and 8k lets say used

tx

HI
noob here believing in the solidity of btc concept.
7.5 cents (us)
i approximated monthly electricity cost to 81 us dollar.
how to calculate the monthly revenue of a antminer s9?

what do you advice me to buy ? used maybe? what to consider , is s9 so old it wont be profitable in 2 years (not sure it would even be atm...)

thanks