Do billionaires affect the area they live in much? I imagine they'd mostly just have a compound in an already rich area, and not interact with the general area much. And then be travelling to other houses of theirs or for business frequently?
Not by their consumer spending or how they live but given that SV billionaires have increasingly become politically activist with their vast sums of money, almost certainly.
Zuck - wanted to run for President as a Democrat
Laurene Powell - huge left wing donor
Google Founders - huge left wing donors
Eric Schmidt - led digital for Clinton, huge Obama backer
Ellison is the only right wing one of the group, the rest have just stepped back from politics, spending less (except Laurene)
Not to mention those just below the cutoff like Dustin Moskovitz.