Here is my mining spreadsheet.

Assumptions: (PLEASE FEEL FREE TO CHALLENGE):

Value of a BTC will always be related to the cost of power to produce it, since that's directly related to difficulty, which in turn is related to Bitcoin's popularity

It's bull shit. Value of BTC is a term of trust. Nothing more. Mining is a waste of time and cost.
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It's bullshit. I got a 5750 back in December for $100, right now I have mined 450BTC. Already had the most of the rig, though.

tryptamine