I just ran a calculation based on VGChartz' sales numbers for December.
I assigned a cash value to each system, based on what it sells for currently in-store. I marked the Gamecube at $50, and the Gameboy Advance at $40 (as neither has a definitive price-point in-store anymore). Note: No matter what, the GBA + GCN prices didn't affect results. I could have given them $0 values and the results you see below would have still ended up the same.
Each system that is on the market at this point in time, I marked at the price you'll find it in-store. The PS3, as there are two different SKUs, I marked at $450, since there's no discerning which sold better - the 40GB or the 80GB.
Resulting calculations:
Sony - total revenue of PS3, PS2, and PSP = $1,804,143,850
Nintendo - total revenue of WII, NDS, GCN, and GBA = $2,091,270,320
As my calculation gave Sony over $1B more than they stated in their release, I'm definitely off with something. However, these calculations DO bring up a very... curious... question. What the heck is Sony doing here, and where are THEIR numbers coming from?
Note: My numbers are also inaccurate due to different costs of each system in the various regions, but I doubt the varying prices affect it that drastically.
Note 2: If I adjust values more in Sony's favour, with the GCN and GBA cut entirely out of the calculations, and with the PS3 having a firm $500 price-point, here are the numbers that result:
Sony - 1,924,005,750
Nintendo - 2,076,358,770
And that still leaves Nintendo quite some distance ahead.
SW-5120-1900-6153