First, not all university donations are the same: donations to the "annual fund" are spent each year and endowed funds are not. When you get postcard in the mail from the alumni association or get a phone call to give $20/month -- it's usually for the annual fund which supports yearly operating expenses. If you want your contribution going to the endowment, you need to specify it when you give the funds.
The whole point of an endowment is to never spend the principal and live off the interest. These are back of the envelope numbers... If an endowment earns 10% interest per year and inflation is 3-4%, then you can spend 5% per year and have the funds grow faster than inflation. If you spend 4%, then the endowment grows even faster. If the economy tanks (like now, when inflation dramatically increases and/or the market doesn't return 8-9%) then you are SOL. Endowed funds are sometimes given for specific purposes like scholarships (academic or athletic), annual lectures, or even faculty positions. Unrestricted donations can be used to support university operations, but again we're only spending interest on the endowment, not the principal.
Points of reference --
at Duke for $1.5 million, you can endow a visiting professorship. An endowed assistant or associate professorship is $2 million. An endowed professorship is $3.5 million. So basically, Duke can pay an endowed professor $175,000 from a $3.5 million gift and the principal should grow enough to keep up with inflation over time.
These numbers are from google but they should be close...
Rutgers endowment: $1.98 billion
Rutgers annual budget: $5.1 billion
Other endowments...
Harvard: $53.2 billion
B1G: Michigan ($17 billion), Northwestern ($16.1 billion), Ohio State ($6.8 billion), Indiana University ($3.3 billion).
SEC: Texas A&M ($18 billion), Georgia ($1.3 billion), Alabama ($1.09 billion), Ole Miss ($775 million)
Here's the thing, none of these funds can be used for NIL. Unlike university donations, NIL deals go directly to the athletes (who must pay tax on the income) and the donor doesn't get a tax deduction. University fundraising is now competing with the NIL deals. Greg knows how much he's going to need in NIL deals to keep our team in place, but the more we direct to the collective, the less there is to build the new indoor practice facility. It's a strange new world. Adapt or perish.