- anyone with enough money to be targeted like this has enough money to get a prenup.
- most states do 50-50 custody these days unless one parent gives up their rights. So any child support would be decent, but not life-changing. Doubly so if the guy is rich enough to be targeted, in which case he's also rich enough to hire a good lawyer. The woman in this scenario has less money, so she can't get as strong a lawyer unless she's gambling that he'll have to pay her legal fees.
- With 50-50 custody the woman can't fly out of state to raise the kids, the court frowns on uprooting them from their hometown / school system.
The only way this makes sense is if the guy relinquishes all his rights to the kid, in which case he's hardly a hero either.
This isn't even considering the ridiculous notion that this woman has a man on the side just waiting for her to get knocked up with some millionaire's child.