Take any successful company, Google, Intel, Apple, Facebook, LinkedIn, Yahoo!, Microsoft, Boeing, any of them. Now compile a list of the first 10 - 100 employees. Now take the net worth for those individuals and compare it to the rest of the world. You'll find it lands north of the 99th percentile.
You can pull out exceptions of course, the sales guy at Sun who was worth several million and lost it all through a series of really poor choices, the Googler who left 6 months in rather than vest that first tranche of stock, the Apple employee who gave up their shares to live a simpler life. But for the most part all of those people have a net worth north of $1M. Ask Charlie Ayers, the original chef at Google if he is mad/bitter/whatever because Larry and Sergey are billionaires and he is just a multimillionaire.
The narrative that founders win and everyone else loses is wrong. You've heard about the abominable failure rate of startups 9 in 10 fail. An employee can get a piece of 10 different startups in 10 years if they move from place to place, vest their 25% of their option and exercise it. A founder is lucky if they get 3 shots at the prize in 10 years. Do the employees who are driving around matching Ferrari's in the Facebook parking lot feel bad that Zuckerberg is worth a lot more than they are? Most of them no, they don't care, they are "rich".
Do founders get the 'fame' ? Sure, is that a good thing or a bad thing? Sometimes it makes you a target. I was amazed at how much Eric Schmidt paid for personal security (its in the 10Q) he can afford it of course but really? You have to hire ex-special forces types because you're too tempting a kidnapping target? I personally would much rather be anonymously wealthy than 'target on your back' wealthy.
One summer I worked at IBM and lost my housing just before my internship was up. I stayed at one of my co-workers places for the last three weeks. He had a computer which he used to monitor the stock market, I helped him enter data into it (which at the time there was no Internet). One evening having just gone through a list of number/value pairs (qty and price) I multiplied them all out in my head and summed them, the result was over $2M. I asked him if that was his savings and he said "yup". I couldn't believe this guy who lived in the same tract house he had been living in for years was a millionaire. Where was the fancy car? the lavish furnishings? None of that. I asked him what it was like, he said, "I worry less about the future than I did before."
My point is that the ecosystem that is Silicon valley creates a lot of those kinds of people. People who don't get caught up in the razmatazz and just save money when they can, diversify when their stock value goes up, and accumulate over time. They are usually "employee" types and not "founder" types though.