Call me naive but I really don't believe that most google/facebook new hires have 250k in net worth.

Let's say that they started at 200k per year(that seems really high). Their take-home would be 135,000 in California. That means after 1.5 years they would have taken home 202500. Even if they managed to graduate from college not only free from student loans but with a net worth of 50k, they would need to save all of their take home for the first year and a half.

Do I think that some people with 1.5 years of experience have a net worth of 300k? Sure. But I certainly don't think it is most.