Because the people who could do something like this are already genetically gifted, and already successful enough that they would not feel the need to go to suc

Because the people who could do something like this are already genetically gifted, and already successful enough that they would not feel the need to go to such risky extents to improve on their genetic makeup. And because simply marrying somebody who is genetically gifted is much easier, and you can do that if you're successful enough in other ways.