because after the 24th the shopping season is over for Europe, and US. as you can see by vgchartz numbers, even with the 24 which is a huge day included sales plummet, i'm giving very high estimates btw, i believe the numbers can't be off by more then 200k.
Your number still dont add up.
Dec 10 is over 10 million, we agree on that.
Then you say 2.5 million over the next 2 weeks.
That brings it up to 12.5 million with one week left in the year.
That final week will still be a few 100k, so ~12.8m
Then you go on to say 12.3 million sounds right.
When the herd loses its way, the shepard must kill the bull that leads them astray.