I have a simple question - and maybe it is better to marry not for money, but for a loved, reciprocating person ?

The thing is, if you marry for money, you become a kind of commodity. And the one who pays, most likely with time will find "more attractive goods, for acceptable money", and ... you'll have neither money nor a happy life. And it doesn't matter what you won't have in the end - crypto or fiat money, you won't have it

That's right.
Also a thing is that you'll like begging for love when you're just going to marry for money. Well, as they say it is just being practical but that practicality will make you suffer emotionally and mentally.
Even if you're that rich but you're not in loved with the person you chose as your partner. At the end of the day, you'll still find for that true love, no riches, no material things, just pure love.