It's funny you should mention "whiteness" as a synonym for beauty and as a means to social "advancement" or privilege. I'm in the middle of reading a book by Franz Fanon called "Black Skin White Masks" and it goes fairly deeply into the question of the influence of colonialism on aesthetic judgment. I recommend it very highly.
I am not surprised that the topic of beauty should elicit sparse and nervous responses on LBO; it's a touchy subject. There was a study done some years ago, you and others refer to it, and the study revealed that physical beauty is not relative: certain aspects-- symmetry, high cheek bones, eyes, figure, good skin are universally admired.
But the other issue you raise I think is more key: that life is easier for attractive people, that they rise (even that they are forced to rise) above the others. Yes, I think that's also a little true. I say somewhat, because I'm willing to bet that there are some very beautiful women (and men) whose beauty was quickly swallowed by hunger, work, childbearing...and the infinite "diabilities" that stalk the poor. For every barefooted Ava Gardener that rose up from the Appalachians to be feted as one of the most beautiful woman in the world, there were probably thousands whose beauty bloomed and was lost in the minute space in which beauty could flower and survive under those conditions. But, if you look at the "first" world, it is harder to see that beauty is not necessarily privileged.
The real question is, assuming that you have had the good fortune to be born comely, what is it worth trading it in for? Money? Fame? And if you do will you not become a mere effigy of that beauty....
Or let me put it another way, if beautiful women sell themselves, sell their beauty...what reason will men have to be brave? And if there are no more brave men in the world, what shall become of the world?
And as for social advancement...what has one advanced to when sitting atop a hill of skulls?
Joanna