Did some research for ya.
This seems to have been quite the random mystery even in classic. If you read over the comments, some folks were evil races and able to sell, some folks were good races and not able to sell. My theory is that it varies by deity. If you look at the Aviak faction page link at the bottom, there are no known ways to either raise or lower the faction.
Krak Windchaser Page
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Krak is found atop the Aviak villiage in South Karana. He is a Merchant and will sell to those who have not damaged their Aviak faction (apprehensive or higher).
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There is no faction hit either way for killing Aviaks
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I don't know about other classes with sneak, but as a human monk go behind him and sneak and if sucessfull he will conn better to you and deal with you.
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Aviak Faction Page