In fact, if they sell today, they'd probably be set for life.
Yes it might be a gamble and speculation, but get it right in a bubble and you're (sort of) set for life. You can make a good calculated bet and see it pay off. Any engineer on $100k to 200k a year can probably afford to put $200k in crypto and recover if it evaporates.
If you compare to certain high risk shares trading on the stock market (i.e. some tech and biotech shares), even though crypto might have a 10x upside, I don't think investing in crypto is 10 times as risky. If you're aggressive, you're probably better off investing in crypto today than in the market.
I was just pointing out that it can be profitable riding a bubble, as long as you're careful about it. I have an old money friend who put in a few million last year. That's exciting stuff.
One thing I wonder: since they own so little, do they even move the market?