I take the point, as variant collecting is certainly not for everyone (and no, it wasn't me with the raised bars!
), and personally I like to be able to see the differences between two figures if I'm going to call them variants. Having said that, each to his or her (do we actually HAVE any regular female members here?!) own, and if another collector enjoys acquiring every single COO available, then fair enough
As for the metallic / iridescent hair Leia, I would class it in the same category as the purple smocked Ugnaught. Unless someone can prove otherwise, I believe I am correct in saying all Unaught smocks started life blue, but some of them have since discoloured to purple. However, since not all blue smocks discolour, clearly there is a difference (and a very obvious one at that!) between the two smock types. Since one type discolours and the other doesn't, personally I class them as separate variants. And following that logic, it could strongly be argued that the metallic haired Leia IS a true variant... albeit perhaps not quite such an exciting one as you might think. I own a metallic pouch Chewbacca, but unless you angle it correctly in the light, you'd never know as most of the time it looks like a bog-standard pouch paint job. I also own a Dengar with one metallic limb!
So buy the Leia if you feel it's something you'd like to own, just be prepared for the possibility of being rather underwhelmed when you have it in hand