You can't compare Adire's authorized sales amount to some egay seller......there is a reason egay is cheaper; there are risks involved. If you want to compare prices of brand A vs. brand B (who happens to have very tight controls over their distrobution network).....then you need to compare authorized dealer vs. authorized dealer. In which case, makes the Brahma over $50 cheaper.
If the Brahma were to leak onto ebay (which I doubt it will in any large quantity), then I'm sure the price would be slightly less than both of those.