Why do people go crazy over attractive good looking people but end up settling for average looking people?

Not saying it’s a bad thing being with an average looking person.
My older brother used to go crazy over Britney Spears back then. He said he wants to marry a girl that looks liked her but he settled for an average woman but she is beautiful and very good to him.
Same with my other brother.
My girl pals and I went crazy over Taylor Lautner, Channing Tatum and Brat Pitt! Whooo weeee! 🔥🔥🔥🔥🔥
But we end up dating average looking guys instead.
My gorgeous cousin prefers average guys and is happily married to one. She is happy that’s all it matters. Him too.
I don’t understand this.