I think a lot of people in this thread are right about some general rules about aid/scholarships and stuff but don't know the specifics of what aid entails, and how much even really good aid can cover.
I am a student at a public, state university in the lowest possible income bracket as far as Federal Aid goes (basically meaning the quantities I list are around the most possible federal aid a student can receive). This past year I qualified for a $5,500 Federal Direct Subsidized loan, a $2,000 Federal Direct Unsubsidized loan, a $1,500 Ohio College Opportunity Grant and a $7,556 Federal Pell Grant. All that comes to $16,557 of government aid for a year. And keep in mind that the federal loans have to be paid back with interest after graduation, which can make people (especially people in a field that doesn't typically thrust people into financial stability immediately after graduation, cough cough theatre).
The college I attend (a relatively high quality, yet public school) costs around $30,000/year for my in-state tuition. That doesn't include books and supplies, which can add up to more than $2000/year. That means that even with high levels of aid, a student is often left to pay half of the tuition themselves. If this student wants to go to a private school or an out of state school for a more prestigious program, the prices can soar up to around $60,000. Even amazing financial aid barely puts a dent in that.
OP is wrong that public universities can't offer grants/scholarships, but they are in high demand (particularly for performing arts), usually don't cover all of school expenses, and by this point in the year it's typically too late to apply for them.
OP is right that students from lower class backgrounds often don't have the same luxury of studying arts/humanities in college as students from higher class backgrounds because of exorbitant costs and family pressure to major in something that can provide financial stability. Theatre has for a long time, unfortunately, had an issue with elitism and exclusionary practices in who can appreciate/enter it. If you don't want to donate I don't mean to force anyone to donate, but this is by no means an unworthy cause.