>I know many early stage employees that achieved significant financial upside by working at early stage startups .Working at an early stage startup is probably the only low-risk way of achieving that.
I mean knowing "many" is different than that being the majority of the cases, and I would strongly dispute that working at a startup is a "low risk" way of achieving some huge financial upside. I in fact remember seeing on Hacker news a few months back (I'll see if I can find it) a study that basically stated that in the aggregate employee stock options at startups aren't worth the risk.