I live in the Middle East, where there are loads of filippino domestic workers. I have worked in a charitable organisation helping some of these ladies who have ended up in extremely abusive employer/employee situations.
For a lot of them, their one ambition in life is to meet someone who will provide them with a passport and a life elsewhere, out of poverty and out of the shitty domestic worker 'career'.
They don't care if the suitor is young or old, rich or poor. They are prepared to abandon husbands and kids back home for a few years, as their carrot is the 'wife of' someone from a western country.
They believe this is their ticket to a better life, she and her family probably feel she has hit the lottery, if it is a bad marriage, she will suffer it for a few years, have a kid or two, and then make her break, she will have educated herself on her rights as a mother of a child of a western nationality, she will know her rights to maintenance etc.
She won't care that her husband treats her as an unpaid housekeeper, that he has little or no input into parenting, the alternative is a whole helluva lot worse, a life of abject poverty.
Her and her family will inevitably be better off in the future, it's quite mercenary, but you can't blame them for taking any opportunity to remove themselves from their miserable life.
I am friends with a beautiful filippino girl, who married a 65 year old American when she was 17years old and moved to the US, had a daughter, trained as a nurse, got her nationality, divorced her husband, and now at age 36 is married to a dream man same age as her, and is pregnant with their first child. Her new husband is extremely well off, they generously support her extended family in the filippines. She says it was all worth it.