Most people don't prioritize self-augmentation; their aspirations lean towards contentment, stability, and the quintessential 'normal life'. The pursuit of self-enhancement often isn't intrinsically rewarding unless one has a predisposition towards it, and even with the impetus, the outcome might not provide the satisfaction one anticipated, or worse.

As for the so-called 'elite' demographic, I will simply say : "Not for lack of trying". (there is this book : "Stealing Fire" [1]). On ancient methods of improvement, it's crucial to note the difference between (super)wisdom and (super)intelligence. But that's a conversation for another time.

[1] https://www.amazon.com/Stealing-Fire-Maverick-Scientists-Rev...