Why do people quote Marilyn Monroe?

I mean she wasn't a great actress (I've watched all her movies). She had an affair with JFK and hasn't ever been able to keep a relationship. She committed suicide. I will admit she was beautiful, but not a role model.

For example, a guy who is cheating on his wife just used the quote "Do not marry an unfaithful man, you might learn something" My response was, She's not really a role model to me since she committed suicide. He hasn't responded, which is fine by me, but why do people thinking quoting her sounds profound?
Why do people quote Marilyn Monroe?
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