The Article simply states that exclusive titles on PS3, such as MGS4, tend to drive higher spike in Hardware sales... when compared to exclusive titles released on other platforms. On the other hand, were as multi-platform titles tend to have very little effect on PS3's hardware sales... and I assume that they tend to provide better results on Xbox 360 and/or Wii.
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My interpretation.
The Article simply states that exclusive titles on PS3, such as MGS4, tend to drive higher spike in Hardware sales... when compared to exclusive titles released on other platforms. On the other hand, were as multi-platform titles tend to have very little effect on PS3's hardware sales... and I assume that they tend to provide better results on Xbox 360 and/or Wii.