Thats because the general public doesn't care about intelligence and IQ tests. The general public is much more interested in celebrity whores puking on the boulevard.
Pity.
Because the answer to the question of the gap - the reason for the difference in educational and economic performance of different populations, such as blacks vs Asians, but also Chinese vs other Asians, Jews vs Gentiles, etc. in many forms around the world, and the means to mitigate it, is literally worth trillions.
The potential value of this is much greater than any other question in social science, or for that matter than any other question in psychology or physiology or medicine.