It's a tradeoff between capex and opex. Right now, the capex costs are so high that you are more or less forced to run miners 24/7, or you never make back the c

It's a tradeoff between capex and opex. Right now, the capex costs are so high that you are more or less forced to run miners 24/7, or you never make back the capex costs. If bitcoin miners were more opex heavy in terms of Total Lifetime Cost, it could make sense to turn them off at night. As Moore's law continues to slow down, miners slowly are becoming more opex heavy.