Why should they? It sells like hotcakes, sure, but what comes out on the 360 can't come out on the Wii in the same way. With the PS3, you've got some graphical competition, a console that is able to handle high-budget nextgen graphics games, just as the 360 does. So, if you've got a major 3rd part game coming out on the 360, there's always the chance that it can go to PS3 as well, because the PS3 can handle it.
The Wii, however, doesn't have that graphical element. A game coming out for 360 would have to be toned down a great deal to be able to run on the Wii, and then you have to take the controller into account.
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