The stock market has plunged 30% in a short period of time. Sure, it might be over a few weeks as opposed to days, but that's just a quantitative difference, not qualitative.
The main value propositions behind bitcoin are:
- stable store of value in its end state (minimal inflation)(note: you'll see wild fluctuations during the interim period where its future is uncertain)
- not under the control of any government or central authority (no risk of hyperinflation)
- easy to store in large quantities (you don't need to buy a large vault just to store all your bitcoin)
- easy to trade in large quantities (you don't need to hire trucks to transport your bitcoin)
- easy to hide from a predatory tax regime (ie, communist takeovers)
- may one day be accepted as a common currency for the above reasons, just like gold 100 years ago
Investing in bitcoin is like investing in a startup. There are no guarantees, its value proposition is contentious, and it requires a leap of faith. I personally refuse to speculate on its success. But I don't see anything innately nonsensical or zero-sum about it