It doesn't cost the fully salary of the woman, it redirects it to something that can't be captured by large scale economics. Which, if you're trying to break the backs of the uber wealthy, is an excellent way to do it.

> Women won't be put back into financial captivity without a fight

This, along with the language of the supposedly "pro-male" camp ("why shackle yourself to someone who will just rough you over for most of your paycheck later and leave") are both approaching marriage wrong. If you're trying to achieve a good that cannot be had individually (a happy marriage) then both sides have to freely give 100% of what the shared good requires. Marriage cannot work as a Mexican standoff between two parties who are trying to take as much as possible from it without giving anything in return.

Dangerous? Yes. It's the most dangerous thing you can ever do, to take yourself in your own hands and offer yourself to another.