I think the biggest argument for schooling is the socialization aspect of it. I don't know about the rest of you but I was bullied pretty relentlessly throughout grade school and it completely changed my personality. I became much more of a loner, reserved, quiet, and just defeated. I'm still working through some of that baggage 30 years later. That's not the socialization that I want for my kids.
I work remotely, my wife freelances. We have lots of friends and family with children our kids age, why not surround them by people who love them?