You probably have not seen even one such case and your opinion is basedupon assumptions. All the cases that i have come across the girls were not the bread winners, rather none of them even had a career, which may also be contributing to their behavior.
The same goes for the women, a man with responsibility of younger siblings is considered less suitable than one who is only son.
You're quite wrong there my friend. Quite wrong. Ive got three very close friends...two of which were primary breadwinners for their families. One of them paid for her whole wedding when she finally did marry because - obviously - her parents didnt have the money. The second only married when her younger ones were able to help out and provide as well. This is just among my super close freinds.
Another friend of mine is an only child and daddy cant work anymore because he is sick. What can she do? The mortgage has to get paid and someone has to do it. So she pays for the house's bills...alone.
My cousin is the primary breadwinner in her house. She is the eldest of three kids, her father suffered a stroke and is paralyzed and cannot work. She graduated two years ago and has been supporting the household single handedly since then.
There are plentyyyy more but that would requre going into more details then are necessary. So suffice to say, its more common then you think.
Every single case I know of is where the girl has no choice but to step up and take care of her family. And she does. But later has to pay for it when people start diagnosing them with "The Unmarried Girl Syndrome". I dont know how you have the courage to post this stuff knowing full well there are PLENTY of unmarried girls on GS past the age that you consider marriageable.