More interesting to me is their ROI. Would they be as wealthy had they just parked their money in an index fund?
Also, why should ROI be most interesting? Is money all we care about? Why is it that we have money?
You're talking about a "what if" as opposed to concrete numbers we do a simple comparison of.
> Is money all we care about?
No, but in the context of the article, it is the metric.
The point is to challenge the premise that their success was only a product of their starting investment.