Beauty is subjective and woman who aren't 8s, 9s and 10s get over on men every day; probably more so. A guy in this very thread said a woman used her guy to build herself up and then dumped him. That's not a win for him unless he felt the honor of sleeping with her was enough. I mean if you consider that an even transaction cool. I personally wouldn't.
average women taking financial advantage of men en masse? Doubtful. If that were the case I wouldn't see so many women mad about splitting dates and paying bills. There'd be nothing to split since he would take care of it all lol. Maybe To very low value men they may. I just said that though. They're not getting over on high value men or men on their level.
Attractiveness is Subjective to a degree. There are exceptions to everything but we all know a convenientionally attractive person when we see one. A person whose looks cast a wide net for suitors.
But even if that were the case those women never stick around. As the example you have provided, that woman had the ability to exercise her hypergamy and level up.
Most women ain't hot enough to "level up" off a man. You gotta snag a man that can level you up first.