Sadly, the lesson some people learned is not that they were part of something FUBAR. Rather, it's more like "get in earlier next time and hand off to some other sucker before reality sets in"
I'm guessing that they didn't learn that, but we may get a chance to run the experiment again. Greed is greed. Growing up in Vegas I watched as people lost their savings more than once. The thought "this time I'll stop when I'm ahead" totally conflicted with "this isn't the peak, just a bit more."
I learned to diversify more (event he "bluechip" tech companies had issues in the dot com bubble) and set reasonable performance targets for my portfolio. But mostly I learned that selling when you hit your target or your failsafes is essential to keeping sane.
