you're better off buying sats right now for that €225. 81 sats/day if you can run it for free wont make you happy.
I'd agree. So somewhere in that equation something is mispriced. S9s basically cost 0$. They are negative after power. I think if we have a free market (btc is not a free market) anything that generated sats would be +ROI.
I'd say the hardware is mispriced. The calculation is sound.