Being attractive is by far the most important

lol, really?

Clearly it is not! It's as if people assume that women are just like men. They really aren't.

And everybody settles eventually, changing that top 20 to 50 and up.

Then that 20% nonsense ends up meaning nothing at all. They try to get the best they can, when they invariably fail, they settle.

Regarding your specific example I don't think we can compare random people walking down the street to women actively playing the dating game at a singles mixer

Those are people who, perhaps for a reason, have not found a guy.