Back when I was fantasizing about what I'd do if I won the lottery, I looked into family offices a bit and concluded that there's basically no point as far as the investing advice goes. It's still likely a good idea for some of the ultra-wealthy for estate, tax, and philanthropic purposes, but on the investment side? The standard passive indexing approach used by middle class individuals scales in a cost-effective ma…
There is one point you haven't considered: Even though a pure indexing strategy is appropriate, it is not appropriate to use Vanguard for this. At the billion-dollar level, assuming that the index funds had an expense ratio of .05% (among the lowest out there) you would be paying annually: 1,000,000,000*.0005 = $500,000 For that level of expense, you could instead have a one-man office or other service provider that…
It would be hard to find someone at this salary level who can match the tracking performance of Vanguard. If they achieve a tracking error that's 1% higher than that of Vanguard's, that would mean an annual loss of approximately $800k compared to Vanguard (1,000,000,000 * 8% * 1%).
[0] https://institutional.vanguard.com/VGApp/iip/site/institutio...