With a home CPU you get a hashrate from about 500,000

0.3 blocks per day
5 BBR per day
0.007BTC per day
Given $670 per BTC, you've mined $4,60 worth.
Elecricity is 2.7 kWh for one Day.
May you pay 0.10$ for 1 kWh it cost you 0.27$ on day.
That's a $4 win.... Where have my calculations gone wrong?!