MGS3 sold 860K at 60$/€ = 51,6M$
MGS4 sold 730K at 70$/€ = 51,1M$
Not such a big difference...
I know my match was stupid since we don't know how much konami earns of each copy sold but... well... It must not be so different.
And I guess a lot of MGS4 will be sold for or after christmas.
They will know Helgan belongs to Helghasts