As i know, at the moment if you invest to mining ROI is reduced too much compare with Q4 2017, Q1 2018 due to BTC, ETH price equal 30% that time, so cost for equipment, electric fee will make more time to get benefit from mining.
Yes, the cost of electricity, the office is too large compared to the current ROI. Instead of mining he can trade and win profits every day, the market is low, buying and selling at higher prices