My last phrasing of this question did not go down well, so I will try again.
The genotype of species is not always the same. If you ask yourself why not all of these possible expressions except one have died out, a natural answer is each genotype occupies a specific niche: For example, different eye colors might be found attractive by different kinds of people. If the the genotype for one eye color became more rare for some reason, other individuals with this genotype had a higher mating chance; the frequency of that genotype would get pushed back up.
But there seem to be genotypes (for example, having zits) that don't occupy any niche at all. Why didn't they die out?
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