@Mushashi, IMO, when a publisher consider to grant time exclusive or even permanent exclusive to one platform (like X360), while their previous game in that series is multiplatform (like COD4), they need to consider compensation not only for the "loss sales", but for "loss of good will" or "boycotting" from hardcore market. If you play COD4 on, say, Wii, and COD5 (COD:WaW) are not available on Wii, you (hardcore gamer, who only own Wii) might consider boycotting or bad-mouthing Activion. This is another area of intangible effect of going single platform from previously multi-platform.
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IMO, when a publisher consider to grant time exclusive or even permanent exclusive to one platform (like X360), while their previous game in that series is multiplatform (like COD4), they need to consider compensation not only for the "loss sales", but for "loss of good will" or "boycotting" from hardcore market. If you play COD4 on, say, Wii, and COD5 (COD:WaW) are not available on Wii, you (hardcore gamer, who only own Wii) might consider boycotting or bad-mouthing Activion. This is another area of intangible effect of going single platform from previously multi-platform.