Thanks to you, Dave, I decided to put a small percentage of my portfolio into BTC and a BTC spot ETF (BITB).

As I see it, the worst (unlikely) outcome is that I'll have 2-5% less to live on in retirement (a negligible downside).

At best, assuming BTC goes 30x in the next decade, I'll have 29-71% more than I'd have by investing solely in more sedate assets (assuming those return 7%/year).

Having that much more upside than downside (with a survivable downside) is a good thing! :)