I'm not sure where hes getting his numbers from but that is incredible wrong. I can't remember the last time digibyte saw a .8 diff but I suspect it was during launch.
The diff varies more now so its more difficult to get an reasonable accurate amount in a calculator.
I've been averaging roughly 1000 DGB every 2-4 hours with 1000 kh/s since the switchover. So about 8000-12000 a day right now but it varies.