The goal of an investment is to make money. Nobody owns a dollar hoping it’ll appreciate in value.

At best you might buy dollars as a hedge if you live in a country where the currency is inflating rapidly and you want to be safe from it. But nobody is buying into dollars as if they were stocks the way people do with crypto, which is what the husband in the OP probably did with ETH.

Currency isn’t supposed to be an investment. If it is, then it’s failed its job as a currency. There are cryptocurrencies that do a much better job at being a currency than eth or btc, which are TERRIBLE currencies, but great for gambling