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To add to that, some even buy into the rather pointless tribal mentality of green vs red etc...Some manufacturers only make cards for one team (XFX, Sapphire, Powercolor, HIS are examples of AMD only vendors) to avoid competing with themselves. Others (ASUS, GB, MSI, etc) make cards for both to cover all bases.
As a result they go and say silly things like they'll never support (insert vendor) and promptly burn a potential financial avenue.