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I think you really all need to think about 3D SPACE as a resource along with power efficiency. The SP30s is just a single blip on the evolutionary chain of miners. There are already designs that are evolving that plug and play box on top of another plug n play box. I am keen on seeing how much mining you can compress into the smallest space possible the SP10 and SP30 are the right direction but it will not stop there. Cases, heatsinks racks take up a lot of valuable space imagine how to shed all that. As for reselling the datatank? You could use it for a lot more than mining and anyone looking into the Datatank should be looking at supplemental income beyond mining for the space.
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Hi guise! Just putting the finishing touches on my nanomodular hyperconducting personal miner with liquid helium phase-change cooling.

When the hardware becomes inefficient (lol, never happen!), the cryochambrer will be repurposed for cryotherapy.

~Dare to think outside the box!