But when would you have enough to start paying people? When the average return on the investment is $150K/year? Do you start paying at $15K/year? Should you raise more money and wait until you can fund $1.5M/year?
But the point is that using a long-term approach - you will be able to pay people orders of magnitude more than if you take the short-term approach.
Long-term becomes the short-term in the future ;). If some businesses had started such an initiative in the past, people would be getting paid in the present - consistently.
100 companies 100k each gives you 10 mill. Just the return on that on any meager performing stock can fully fund 1 SV dev, indefinitely. Or, you can withdraw a couple mil from the fund per year, fully fund the entire project for 3-5 years or so. Investment is just a way to stretch out the fund.