If I was one of the very, very few who support large families with state aid, why would I swap my 50k of state aid to have several children for your 10k? That way I lose money and lose out on my natural drive to reproduce. What do you think will happen?
But I'm sure those many people who had no intention of having children would take you up on your offer but I'm not sure I'd be willing for my taxes to fund this ludicrous give away