Sure, for the right sort of people, a direct donation of status can be effective (maybe even optimally so), just like there are some people who should actually work at SIAI.

Probably not the case for typical academic high-status, however. Perhaps the endorsement of Andrew Wiles or Stephen Hawking would be worth more than either of them could actually afford to donate; but your typical leader-of-a-subfield would probably be more effective by donating money from their atypically-high academic salary.

Also note that the status of people like Thiel and Kurzweil is itself intimately connected to the money they've made.