Why Are Beautiful/Handsome People Rare?

Although beauty is subjective most people can be agreeing in that they doesn't find everyone beautiful/handsome and that most people are average (and some even less nice looking). I'm wondering if there's a scientific reason on why beauty (especially conventional beauty) are rare. Scientific explanations are appreciated. I would also like to hear from your experiences. #Beauty
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Why Are Beautiful/Handsome People Rare?
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