It was not fair what happened, and in many ways, my ex-wife was the architect and builder of the divorce.
Today, the law serves the best interest of the kids and the mom. Dad is seen as the breadwinner, and thus the "paycheck" for divorcing moms who are showed the divorce brochure and the good deal they are being offered.
Yes, kids are expensive, but they should be equally shared as an expense and as a joy. This 70/30 split is bullshit. It's demeaning to fathers. And it's based on a parenting concept from the 50's. Sure it makes it easier on the courts if everyone just goes with the plan. But don't. If you want the time with your kids, fight for it.