It's ENTIRELY practical to set it up as a profitable business on a LOT less than "millions" - just not HUGE scale, and you have to mind the costs a bit closer than the big-scale folks can get away with.

 $100k would be PLENTY to start up a small professional mining farm BUSINESS - I'm pretty sure I've got less than HALF that invested INCLUDING reinvestment of a lot of my mining income for the 4 years or so I mined "as a hobby".


 Cooling costs had better be a LOT less than 50% of your electric use - you can do mechanical air conditioning for less than that, and THAT makes costs quite a bit too high to be truely competative.
 If you're putting much more than 10% of your electric usage into cooling, you need to rethink your cooling setup.

 Don't count on getting a business loan though, Cryptocoin mining is a LOT too speculative for most banks to even think about dealing with.


 For a small farm, you don't NEED staff.

 Water usage should be very small, unless you are using evaporative cooling - then it's STILL pretty small.

 Idaho electric rates aren't all THAT low - for low electric rates in the USA, you're looking at 3 specific counties in Central Washington state.
 Idaho might be a good bit less than 11 cents/KWH in areas it's got hydropower access though - but it's certainly not in the 3 cent ballpark.