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One can carry this analogy to getting married:

The odds are extremely high that one actually marries the right person given the billions of people to choose from. Yet, so many of us do get married.

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You make the assumption that there is one (or a few) "right" persons to marry. That is not necessarily the case. It's a mutually beneficial partnership (in theory), that's all. Don't sart getting all Danielle Steele on us.