FC was talking about finding cheap electricity at the Salon back in August. Let's not for about the DataTank partnership as well.
DataTank doesn't make the electricity cheaper.
Even if they have super cheap electricity why not use if for more self mining?
The only thing that would make sense to me is if they were using gen4 as cloud mining making profits, kept selling gen3 prismas, then when the timing is right release gen4 chips to public and start gen4 prismas since the chips are apparently interchangable if I'm not wrong