For me personally - I can't lose. Whatever fiat (dollars) I've invested into crypto, I've already got back more in dollars. So my investment is already profitable. The crypto I have now (and am still buying) is essentially all profit, so I can let it all ride if I want. But to your second point - 9 years of Bitcoin and crypto gains, bubbles, busts and more bubbles isn't enough? That looks like plenty of history. But of course still a risky asset to be sure.

One thing I always like to point out to people is that you have to look at Bitcoin prices on a logarithmic scale because a linear scale doesn't show you anything meaningful other than a parabolic curve, But this tells me that a Bitcoin chart (and crypto in general) is not the price of a commodity, but an adoption curve. Look at the adoption of technologies (such as radio, tv, internet, cell phones etc) to see what I mean. They are all parabolic curves over a few decades. If that's true, then we are still likely at the bottom of that adoption curve. That means massive growth ahead. That's a risk/reward I won't miss out on.