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 can buy the individual stocks comprising (or closely approximating) the index, and not have to pay any expenses other than his salary and trading costs. Meanwhile he can provide tax planning/philanthropic services as well.
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 can buy the individual stocks comprising (or closely approximating) the index, and not have to pay any expenses other than his salary and trading costs. Meanwhile he can provide tax planning/philanthropic services as well.