There's no paywall on the article? Unusual for WSJ. So I read it! I have no problem with what her parents are doing. They're only playing around with 10% to 20

There's no paywall on the article? Unusual for WSJ. So I read it! I have no problem with what her parents are doing. They're only playing around with 10% to 20% of their wealth. This is what Jim Cramer calls "Mad Money", which originally was the whole premise of his CNBC show of the same name. (That show has since morphed a bit in style). The idea of mad money is to be allowed to go crazy and speculate with a relatively small portion of your wealth. If you're having fun with that, maybe you'll also keep doing the research to keep up with the relatively boring rest of your portfolio (such as index funds and blue chip stocks). You need to keep reminding yourself all the time that you could lose most or all of the crazy speculative money. Because there's a reasonable chance that you will. I watched this same thing happen during the dot com boom of the late 1990s. When it was all over, many companies fell by 90%. Many others just simply disappeared. There's no harm in buying Zoom at the start of a pandemic. Sure you're somewhat dependent on the "greater fool" to take you out of your investment, but at the moment there seems to be no shortage of those.