Nicely written first post there nemo. Lets see if I can put some of my business schooling into this.
As far as the Soul Calibur 2 comemrcials go, each platform had their own commercial. Nintendo put out more money to advertise it's version sooner and more often than Sony or MS did. And it paid off emensely. I still see the PS2 commercial everyonce in a while late at night, only saw the Xbox one a few times, but saw the Cube ones many times when the game launched.
Now the EA debacle. I have yet to see and Xbox only ad for a large EA game. The commercials for SSX 3 have only shown PS2 and Cube. The PS2 ones mention "exclusively online only for PS2" because it only online for PS2. Then there are others for the Cube which show the Cube logo, and the "connected" thingy at the bottom for GBA/Cube connection. I would not be surpised if the Cube version of SSX 3 outsells the Xbox version cept for 1080 coming out soon. EA has already badmouthed MS and shown their disgust by not giving them any online support because of the way MS wants to control the online infrastructure.
Since Iwata has taken over, there have been many more actions behind the scenes that we will either never see or won't see in a long time because of the time it takes for those plans to pan out. One of those is the exclusive title thing. We know as you have said that Miyamoto would be working with EA on some games. But development takes time. They are probably working on at least one or two titles as we speak. Now begs the question whether or not Nintendo is paying for the extra advertising, or help pay for development.
Whether Nintendo forked over more money for the exclusive advertising or not doesn't matter. Somehow they got EA and such to do it. Like I mentioned to PIAC the other night on MSN, the Cube's game boxes are never noticed even by me in the multiplatform box shots. The PS2 one is always infront, Xbox has the green box, GBA has the huge logo along the edge of the box, and PC and Cube boxes look basically the same cept for the Cube part at the top. But it is usually too far behind the other boxes for it to be seen. This last half of the year, it does look like Nintendo is starting to come through with what they have said they would at E3 with some games and advertising.
Sadly, the truth is that the video game industry has gone ugly. Nintendo seems to be one of the only developers (maybe EA too) that still plays fair. Midway canceling both The Suffering and ESPionage was a disappointment. Whether the games will end up good or not is a totally different question. My guess is because of Midway's lack of money, MS paid them to continue development on each title where Nintendo would not. I know that I was at least interested in renting each title to give them a try, but now that money will go elsewhere to hopefully buying more games. Companies won't make games anymore for the sake of making them. They are only looking for money and the cheapest cheesiest way to get it.
If Nintendo wants to keep getting these third party games onboard, and showing them that their games will sell, they need to contribute. If that means paying for development, paying for exclusive advertising spots, licensing out franchises, or consulting in the development a la Konami with MGSTTS, they need to do something. But the third parties must also realize that MS and Sony do not have the in-house development talent that Nintendo does. So there is less room for their games to sell in the first place. If they know that a game will not sell as much, then plain and simply don't press so many discs of them. Nintendo has the money and the resources, they just have to learn how to utilize them best so that all three parties (Nintendo,develpment company, and us) will be happier in the end. Whew, that was long

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