I don’t really have anything to back this up other than my gut, but I would bet that willingness to help with fundraising is based on more of an ideological affinity with the cause than any sense of personal gain. I don’t think it’s a coincidence that so many finance people are there, since they are, in my experience, most ideologically aligned with the modus operandi of the university’s higher administration.
And of course this goes both ways. UChicago needs to find people that aren’t critical of the institution (at the very least - preferably they should be enthusiastic about it). There is no way UChicago would want me talking to donors, basically, regardless of what I end up doing.