OP, since you're probably young and naive, let me help you out. Sit down, this might take a minute.
College is a scam. Full stop. A total scam. Especially in the United States, where your "education" will cost 5 to 8 times more of an identical education in other developed countries. The quality of your education, with rare exceptions, is no better in these other countries.
Why is this you might ask? Well, it has nothing to do with a few hundred PhD students getting paid 20k to actually do work (i.e. teach classes). It's because universities in the United States are businesses before anything else (yes, that includes public schools). But their goals are aligned somewhat differently than private enterprise. Here's why
Despite what their marketing brochures and admissions counselors tell you, colleges mainly exist for the following reasons:
1. To increase the size of their endowment
2. To serve as a vehicle of social engineering for impressionable young people
3. To act as gatekeepers to the modern middle class (it's a pay to play system. If you want to be middle class or above, you have to pay in. That's why you pay so much to go)
4. To conduct research that serves the interests of certain parties or groups within the federal government
To keep things very brief, the majority of your tuition dollars goes to paying admin salaries. The majority of these admins have little to no impact on any aspect of your college life. They do not improve it and in many ways, they probably make it worse. Colleges and Universities are stacked with hundreds of these bumbling morons - some are a necessarily evil, others are worse than useless. And many are making 300k+/year. Most make well over 100k.
Now that we've cleared that up, you can hopefully begin to use your college education to start thinking, and direct your justifiable outrage at the right parties instead of some poor PhD students