I really think that the rare metal mining of asteroids is so far into the future, that it is not worth wasting time taking that into account. It will not happen in our lifetimes.
I like cryptocurrency because it's out of the government's control, but it is not yet at the point where the average person can use it easily and securely. So far, it's mostly being used for speculation, it seems, as you have done (successfully, apparently!).
Governments don't like crypto so I think I would like it for that reason alone, if for no other.
Crypto is great as a currency (not money, store of value). There's no third party that's promising something inside a vault somewhere, so the value is entirely based on its non-physical characteristics. You can own crypto without the need for any physical object under your control (just a memorized recovery phrase). It entirely bypasses countries trying to prevent you from moving value across its border.
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