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.
Well, you don't have to beg for love if it's about money at times, money hands it freely, you can see this being practicalized especially in ladies. Ladies will for example claim they love you for many things, it could be due to your money, your height, your charisma, your personality, being a jovier person, your wisdom and many more. For this, you see that ladies could love you for the money, they could be gold diggers, yet they might be faithful to you and play their role as your wife and the mother of your children successfully as long as you are good to them.
So, it's not about true love all the time, something triggers union, and there are some who started with true love but didn't make the marriage work out in the end, so what's the point? Money or no money, once she's ready to be with you sincerely, it's good and money is not the sole judge of whether she will be with you or not, just the same way money could cause her to be with you forever as well. It's all about something triggering it and both parties helping it to work out.