LOL, Jenna!
Personally, I think it is a bit nutty having so many children. But, this family is financially stable (they have ZERO debt), they have bought enough land for their children to eventually build on it if they choose, they home school, so they are "costing the system" anything. I'd say if this is how they feel comfortable, then good for them.
Sounds silly, but I really don't know how they have the time to.. ahem...
make 18 kids! I mean, seriously, how do you not just collapse in bed every evening?!
My DH hates huge families (literally, he's gotten mad and stormed out of the room when I've watched this family before!), but seriously, this family of 19+ functions better than his household of four ever did, so who on earth is he to judge?
I say good for them, and I wish them all the best.