Just that, really.
I see a lot of threads that complain of the lack of bursaries available at independent schools or even the high fees now charged by universities. Or people complain about the lack of facilities at state schools... all the while, never thinking about parting with their own money.
In the U.S., schools like Phillips Exeter Academy can make offers needs-blind due to their huge endowments that has been accumulated over (presumably) centuries. If the family of an accepted candidate has an income of less than $75k a year, then that child's education will be free. They offer aid for families all the way up to those with a family income of $200k a year.
Same thing goes for Harvard. Yes, outside of the U.S., we think it's an elitist uni where only the rich can go, but if you are good enough to get in, your family does not pay tuition unless they earn more than $150k a year. And even above that, your parents may pay only 10% of their annual salary, which makes it a much cheaper option than British universities.
Again, the above can be done partly due to endowment funds that are frequently 'stocked up' by alumnis. If we ever want the same system, I think all of us should donate to our alma mater now.
Goes off to alma mater's website to donate a small amount.