> Seriously, say I am building a company worth 100m on paper. You think if I marry someone she should be entitled to a large fraction of that? Why? Let’s assume she doesn’t do anything with the business. Say she was an accountant when we met and continues to be one after. Sure, she can’t tell me what mansion to buy, etc, but those are things to work out. Am I a guy to totally ignore her desires? If so, she shouldn’t marry me.

Alternatively, say you are building a company worth 100m on paper, and as a result, when she ends up pregnant with kids, you insist that she should work less hours, or maybe stop working altogether, in order to take care of them. (After all, you are busy building a company worth 100m on paper).

You don't think she is entitled to a large fraction of that? Why not?

Marriage isn't meant for you to protect your winnings from the Silicon Valley startup lottery; it's meant to allow for partnership, which includes earning your way in the world together and making choices together, to benefit the family, with security for both partners in the worst-case event of a divorce.