Although it's a little annoying to have one more mouth in the house, and one more person who needs something sometimes, somehow more kids = less kids in the long run.
Sure, sometimes I still want to hit people, but all in all, they keep each other busy. Even little kid. THAT is the delightful part about this arrangement. If I could be sure that it would always work out this way, I'd adopt us a child. Just to keep little kid busy and quiet.
That's why the Duggars have so many kids. 18 kids probably = -9 kids somehow. And you'd have built in housekeepers if you trained them right.