You're advocating the idea that those less affluent can only have genetically disease free kids if they themselves are free of genetic disease.
No, I'm advocating that everyone take a step back and ask "does the world really need another mouth to feed?", regardless of genetic suitability. Deciding not to have a child because it may be afflicted by a genetically inherited condition, in my opinion, is a noble choice. Spending $$$ on a method to circumvent this natural limitation just so you can have a brand new little copy of yourself seems a bit selfish. The more diseases we cure, the more babies we have, the longer we extend natural lifespans, the closer we get to resource scarcity. Take a look at places in the third world with rampant disease and famine. It's not because god hates them or they're unlucky, it's in part because they're producing more mouths than the land can feed. We will some day reach that point as well, but we shouldn't just go running full speed towards it because we all feel some biological need to reproduce. That's what sets us apart from the animals, right? The ability to reason and think about the consequences of our actions, and plan accordingly?