To what extent do leagues exist in dating?

Do you think leagues exist in dating, and if so to what extent? Why would someone (women especially) date below their league? If a girl is very good looking, self-confident, bubbly, has a good social status in terms of friends, has a good job and good ambitions (albeit sub par grades), what do you think she'd look for in her league?

To what extent do leagues exist in dating?
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