You are not taking into account of career opportunities to move up. We scraped by with 2 in daycare at first but years later both our careers have advanced while cost of daycare has dropped with them moving into after school care only. I have dealt with stay at home parents. They are a weird bunch with hours of only kids to talk to.....
And what is it that this extra money you make yields?
And how much do you value "raising your child"?