Average rate of return per Hash Rate, i.e. how much income can be earned reliably per a given amount of time? For example will the income average $5 per month?
Average power consumed per Hash Rate. Knowing this will permit determination of power cost. A basic formula with input 'Hash Rate' and 'Kilowatt/Hour cost' would yield an approximate cost per month of power.
With knowledge of 1 and 2 a P/L model can be determined and risk assessed.
A list of things to know and understand about digital currency