Don't worry BTC is still over TWICE as profitable than every other mainstream investment.
1gh/sec
$8 per BTC
1000KW
.15 KW/hr
30 days
Coins per 24h at these conditions: 0.5658 BTC
Power cost per 24h: 3.60 USD
Revenue per day: 4.53 USD
... less power costs: 0.93 USD
Power cost per time frame: 109.57 USD
Revenue per time frame: 133.86 USD
... less power costs: 24.29 USD
Net profit first time frame: 24.29 USD
Profit Margin = 18%
https://docs.google.com/document/pubimage?id=1s9K93oRTI6AwGqZ1cpAOvW6HyKhqSdggVO0_ignOONw&image_id=1kXwssAy6yqKlftv5wrFUurmYC2hJVg4Let's compare to other endevours....
Historical US corporate profit margin is 5.5% to 7.5%.
Historical US Equities yield is 9% to 11%
OK, but in order to complete your analysis which compares the gross operating margin of bitcoin mining to other investment instruments, consideration needs to go to 1) the capital cost of the mining rigs and 2) the volatility of the underlying commodity and the associated risk premium. Even if you just take the volatility of the BTC as your cost of capital, the math changes significantly.