Universities charge students large tuition fees and then pay the students very large salaries. After the tuition is subtract, the students make very little. All

Universities charge students large tuition fees and then pay the students very large salaries. After the tuition is subtract, the students make very little. All the tuition is tax free. Universities can easy fix this by just charging the students a tiny tuition fee so that the students new tax burden is minuscule? The money paid to the graduate students could be the same (very little). So what's the problem? Is it that Universities route money through the graduate student accounts to avoid paying taxes on it and now they are upset that their tax loophole might be closed?