I'm interested in this too... cost / return excluding electric.

I'm self employed and my office space includes electric in the rent. I bet you can guess where I mine.... Moral of the story - rent an office, fill it with miners.

Honestly I' using it as a hedge against USD inflation.

These seem to make sense - I've been on the forum way more than 4 hours, but never made a login, because I was just lurking for so long.