(...) At 40% AM would receive 2400 a day on average (40% of the average of 6000 coins per day) (...)
Just a small correction on this: 25 BTC per block * 6 blocks per hour * 24 hours per day = 3600 BTC per day.
40% of 3600 = 1440.
(Assuming steady-state difficulty and hashrate.)
Now please continue with your previously scheduled discussion...