Wait, what? Are you sure you're reaching the right conclusion? It sounds like your anecdote supports the opposite once you stop looking inter-your-small-group, and start comparing groups. Have you compared median wage data for your elite university versus median wage data for the country you are in? I suspect the difference is noticeable.
It appears you are making the mistake of comparing a group of successful entrepreneurs, failed entrepreneurs, and people who went to work at Goog and McKinsey with each-other, but you really need to compare that group to people who couldn't get a job at Google or McKinsey at all. Obviously life is not nearly that uni-dimensional, but I'd wager your median "all really smart" colleague is wildly beating the median person, even if some of them are broke.
They probably are smarter though! If they weren't, they wouldn't get in.
I've contracted with Google a couple times, just like >50% of their workforce.
Would I like millions? Sure. Do I have that? No. Would I work myself to death for it? No. Do I believe Google [or whatever FAANG company you want] is The Greatest Everest Of All? I'm smarter than that and you should be as well.
Out of 170 graduates, 27 went to facebook, 21 went to google, 13 went to microsoft, 6 went to amazon, 2 went to apple, etc. That's basically half the class including a lot of people from the bottom half of the class (the best people I knew usually didn't choose FAAMG and their outcomes were a crapshoot).
Out of about ~150 graduates at my undergrad, I think 3 went to Amazon (including myself), 1 went to Facebook, 1 went to Microsoft in a support role and the rest went to Cisco, IBM, and consulting companies.
I wonder why CMU only had 6 to Amazon. That seems low! I think trading firms like JS, Two Sigma, Jump and Ansatz had more combined...
I am looking at MIT's salary survey and they have similar ratios: https://capd.mit.edu/sites/default/files/about/files/GSS2017...
Why is that?
Also, MIT's distribution seems very different. Amazon and Facebook are near equal and GM takes a big chunk, which is not what I would have expected. Oracle is also around the same as my undergrad.
Did the guys who went to work for Google take any additional risk? Yet, they are now millionaires. How about the entrepreneurs? A few are super rich now. The guy who went to work at McKinsey is now a pubco COO making millions.
Yes, by my direct observation, it’s mostly chance.