The Real Focus of Drug Manufacturing

...should be to legitimately unlock our mental boundaries. As I gratefully finish off my Z-Pak to kill the crud I wonder why we spend billions (trillions?) to heal our bodies and not do the same to develop drugs that actually enhance specific parts of the brain to increase productivity or an ability to learn? Surely this kind of testing has been going on for decades so is there a reason it is not available or not achieved? It takes us into Sci-Fi realm but one group willing to be test subjects could be responsible for creating new vaccines, environmentally friendly energy and new replenishable food and water sources.
To take this one step further: what would be the consequences of a society where everyone was as intellectual as the next person? (amazingly, this is not a drunk post). Post is too long, but I know there are smarter minds that can fill in the blanks...