It's a simple matter of incentives. The government pays you if your researchers are good, and some private entities may also contribute. Nobody is willing to pa

It's a simple matter of incentives. The government pays you if your researchers are good, and some private entities may also contribute. Nobody is willing to pay more if your teachers are good. And then there is the reputational effect. Graduates from prestigious research universities are in high demand, while nobody cares much if your teachers are good.