If you are looking for bang for the buck in raising the average IQ across the whole population, then there are serious quick wins in eliminating things that drag it down. For instance, exposure to lead. And it's doable, hardly rocket science or genetic engineering.
If you're looking for a few very rich people to give their offspring another advantage over the rest, then genetic engineering becomes more pertinent.
Much cheaper than eugenics.
In addition to facing fewer ethical pitfalls, greatly reducing these environmental factors is well within our current means. It also universally beneficial, and not limited to those who can afford "Boutique" offspring.
You can have the second at some time in the future if the research works out and you can afford it.
If the world economy could eliminate your job without missing it, then you are no longer generating trash to clean up, and that job goes away too. The person who cleans up after someone genuinely productive therefore contributes more than someone who cleans up after someone useless.
This is, no doubt why we pretend with all the might of imagination that certain jobs are critical and vital to the economy. The idea that double-digit percentages of the whole world economy could actually just be wasted on useless navel-gazing nonsense is just too horrible to consider. It may be true, but if we believe it is true, that just means we're all wasting our lives on pointless bullshit. I'd rather lie to myself and be happy, regarding this particular point.
Our role as the elite is to elevate and recognize their worth, and not sink them to our moral level.
Also, when thinking about creating value, you need to think about scale. They change your trash and are limited by their physical ability and time. Let's say they saved you 4 minutes and changed 400 trashes, saving 399 other people 4 minutes. They've created ~24 hours of value.
If your app helps people save 30 seconds a day and did that for 100k people, then you created about 12 days more value.
At the very least the lady emptying the trash keeps the place hygienic, reducing the spread of diseases.
You can't be naive enough to think that this problem wouldn't occur. On the contrary, if genetic engineering on such a level was realized (which would require a shift in our current biomedical ethics to begin with), discrimination against the less-optimized would be a foregone conclusion.
In such a scenario, we could only hope that everyone would be optimized equally and the suboptimal humans wouldn't be born into a world where they are second class citizens.
Keeping people from discrimination may be about as difficult as perfecting genetic engineering.
Do you have any data to back this up? Do you have a reliable measure of "contribution to society"?
The primary problem to solve is discrimination against non-engineered people. That problem was the only reason Gattaca was so dystopian. As long as there are controls in place that make it difficult, it should be possible to move forward with engineering humans in a productive way.