What are you talking about, of course sourcing new endowments allows them to build more things/provide more services/etc. Approximately half of Yale's operating budget comes from revenue generated by its hospital system (which is a whole 'nother contentious issue, but besides the point). The other half largely comes from drawing a "safe amount" on it's endowment principal, i.e., small enough to be sustainable in the long term without depleting the fund. A relatively small part comes from tuition. Obviously, increasing the endowment (be it $2.5MM or $250MM at a time) increases the amount that can be put towards budgeting in the future -- enabling, for example, the University to grow its student body (which Yale is currently doing) while maintaining the ability to privately subsidize student tuition.