I was introduced to Bitcoin in 2011 by a friend. I'd never heard of it before, and it sounded like something I'd not be interested in. I didn't go all-in with him renting an apartment where the cost of electricity
was paid by the landlord, it's basically free, but he 'gave' me some in lieu of his bar bill, just a handful, with the proviso I hang on to it and spread the word that there was use for it.
In that long conversation, the most compelling 'use' was it's 'non use'. That it is intrinsically rare and so as long as it's achieved a sufficient momentum to continue to exist (aside from transactions, we went over various uses for the blockchain that I was struggling to understand), just having some is itself a diversification and thus valuable for that. Diversification like having some precious metal is too. 'Having' being an important point. Another friend was a gold nut (I mean that in a non-pejorative sense, a term he used) that wouldn't touch gold futures or any form of 'contractual gold' and wasn't that keen even on security boxes.
In this, Bitcoin did make some sense. Just hanging on to some. Not for investment purposes, and not for speculative purposes, but for, depending on your perception, the value you may find in something 'rare' in your (somewhat) physical possession. This may be for a time of turmoil when 'rare' assets are extremely valuable, especially divisible ones (sufficiently 'rare' cash, for example, is well documented to be valuable at these times). 'How much' depending on your appetite: appetite for an asset _held for this purpose_ (a purpose that isn't investment or from-time-to-time speculation), and this 'how much' (price*quantity) re-balanced not based on a Bitcoin's price (nor gold's price per ounce) - from this perspective the day-to-day 'price' of Bitcoin becomes less relevant, re-balancing better smoothed than marked-to-market daily given it's volatility.
[A small aside, but on this 'rarity': I remember clearly the first time I held a gold bar, by no means a common occurrence in my life. It was beautiful. Shaped more like a house brick than something stacked in Fort Knox, it had the portrait a family embossed on it, two parents, three children, the family dog, the chateau in which they lived, and their signatures. It was cast at the time of the French Revolution, and sits, certainly when I handled it and I imagine still today, unclaimed, in London, where it was sent for safe keeping. Sad.]