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Basically X-Box and PS2 try and out-do each other by releasing exclusives.
eg: San Andreas and MGS3 vs. Halo2
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Sony and Microsoft dont actually make these games, it just so happens that they are exclusive to those consoles. However Rockstar (GTA) are going to be unexclusive as soon as their contract with Sony expires. Konami (MGS) however I don't think they'll bother, as I heard MGS2:Substance sold poorly on the Xbox. Which is a shame, as I love MGS.