The median employee also isn't the guy who's going to make a killing by being an instrumental early employee at startup. It's apples and oranges. I'd argue that the person who is versatile and productive enough to help build a startup from zero is also in the upper tier of those FAANG employees, and commanding 400k+ per year isn't out of reach.
I personally have taken both paths, and made what I considered a ridiculous amount of money at a startup (after I'd been gone for a while, having bought my stock). When I got my cash out, I didn't quit my not-technically-FAANG-but-pretty-close job and that comp continues to grow. I never expected this, but my comp has grown to the point where the cumulative amount I've made here has actually surpassed the startup money. 7 years at each place, and the steady paycheck eventually outpaced the big windfall. The difference is I can keep the steady paycheck indefinitely, so it's definitely the win if I stick it out. Of course, now I'm itching to do a startup again. :)
I personally have taken both paths, and made what I considered a ridiculous amount of money at a startup (after I'd been gone for a while, having bought my stock). When I got my cash out, I didn't quit my not-technically-FAANG-but-pretty-close job and that comp continues to grow. I never expected this, but my comp has grown to the point where the cumulative amount I've made here has actually surpassed the startup money. 7 years at each place, and the steady paycheck eventually outpaced the big windfall. The difference is I can keep the steady paycheck indefinitely, so it's definitely the win if I stick it out. Of course, now I'm itching to do a startup again. :)