if you have free power and nobody has to listen it's awesome.
Even with free power you still have the cost of the money you put in place and your time along with any import fees and rental costs.
As a space heater then it works well at 9500 USD/BTC getting you a small profit of 0.04BTC over the course of 1.5 years of babysitting.
An
estimated 0.04
BTC over 1.5 years. Damn near nowhere certain.
Also out of curiosity because it's very difficult to read that spreadsheet, does that include the large chunk of money you'll get back when you go to sell and upgrade miners in the future or are you just for some reason assuming that it will be a piece of metal to throw in the garbage?