"Employees seldom see a big payoff. Period."
Yeah this is an obvious but oft-overlooked fact. As a VC you can manage the high rate of failure of startups by investing in many of them simultaneously.. that's what the whole model is based on.
As an employee, not so much, you're probably doing 2 fulltime jobs worth of work for one single company very likely to fail.
This is why working for shitty pay in return for non-founder equity is a very -EV financial move (I'll allow that maybe it makes sense for some people as a learning experience or whatever). And this is without even getting into the fact that your company could have a very successful exit and your equity could still evaporate due to dilution or outright clawback of options (ala Zynga's pre-IPO moves), or any number of dick moves from the founders/investors.