If we could make most children smart, productive, ambitious, courteous, civil, conscientious, honorable, strong... the value to society is probably high enough to justify covering it for almost anyone.
Somehow society (or indeed parts of it) decided to use it as a tool of further segregation rather than overall prosperity. I’m afraid same might apply to this.
I don't really see how this affects e.g. what I do for my children. I will absolutely be turning them into the closest to superhuman the current state of treatments lets me, traveling internationally if I need to. If someone else decides to segregate access to treatment, that is a separate, wrong act that will not hold me back from giving my children every advantage possible.
(Yes, I understand this is a positional arms race, but 1. that doesn't change the individually-optimal outcome, and 2. that doesn't change that society net benefits from it.)
I am, afraid, that this kind of genome modification will further increase divide in a society and turn social lifts off even more. I.e. it's not gonna be your kid to get "improve" brain genes first, and later your kid wouldn't get a chance to get it ever again for their children.
Just to be clear I'm not against of the progress, this thing is fascinating and really shows how awesome humans are. And I get why you'll get it if possible for your kid. I'm just not sure its benefits for the society mean it's gonna be anyhow affordable for regular people.