Beauty is in the eye of the beholder!
Clearly a trip to any grocery store, mall, park, movies, or even church and you are likely to see people of (all shapes, sizes, and colors) who are paired up with mates. Therefore any woman who believes her "looks" are the reason she does not have a man is making up an excuse/reason to either blame men or put herself down.
The real issue is she (does not want) the kind of men she sees with other women who are (in her same league). This is also true of men as well. Everyone wants the "best looking/hottest person" they can attract.
The upside for unattractive men is there are lots of beautiful women who will date them if he is (rich, powerful, famous, or successful). By contrast there will never be a "female equivalent" of Hugh Hefner founder of Playboy Magazine, (a 83 year old denture wearing rich person) with a line of hot looking studs in their 20s waiting to sleep with her.
Most men are not interested in a woman's wealth. It doesn't matter to most men whether a woman is a doctor or a waitress if he considers her to be (hot/beautiful). A successful woman however is not likely date a restaurant bus boy who has no ambitions for the future.