You havent heard enough stories.
Plenty of women do the same when the man gets sick. They toss him in a cheap nursing home and then take everything and leave.
It happens more than you think and its hardly one sided. In any case its sickening behavior.
So, what do you do for sex?
I've heard all the stories from both women and men.
Some people (both men and women) take advantage of other people.
It's sad, and sometimes the system stinks, and sometimes men complain about women, and sometimes women complain about men.
But, one group (women or men) really isn't to blame for everything.