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 In my mind anything that generates sats is positive ROI. 
 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.