The sats earned from the S9 may eventually be more valuable than the cost of the energy required to run the S9 if you have a low enough time preference. (also KYC free sats, securing muh network, and learning how mining works)
Discussion
the goal is to acquire as many sats as possible. buying an appliance that was manufactured in 2016 to acquire KYC sats for a loss in 2023 is suboptimal. the smart move is to stay humble and stack sats. if you are mining for a loss, you are actually losing sats and a drag on bitcoin adoption. obviously in the future the sats you mine will be worth more. but if you just buy sats and continue living your life, those sats will also be worth more (and you'll have more of them bc you didn't buy an appliance and you didn't pay for electricity).