>In the current economic climate, it is pretty much a waste "investing" in anything until you have, say, an 8-figure sum in cash laying around doing nothing.
Why do you say that? It is clear that money can be made investing with less than an 8-figure sum. For instance, the Vanguard S&P500 index fund returned 22% last year and 10.66% since its introduction in 1976. The fund minimum is $3,000.