This colleague of Robin Hanson thinks it's pretty great.

Also, revealed preferences reveal very little in this case, because:

(a) even if you don't want kids, you might prefer to make that choice for yourself

(b) some well-off people do choose to have kids

(c) almost nobody is so well-off that having kids would entail a relatively small financial sacrifice, in part because well-off people are expected to (and do) spend more money on their kids