You are conflating 2 things. The perceived value of a the magic beans as an investment strategy. Which I think is a very bad investment in the long run, with the concepts of blockchain and ledgers, which I think will be hugely useful.
The transaction costs still seem to be eye watering. And the energy use solving piuzzles for the magic beans cannot be a good thing. Even if you say it is renewable, you are taking wind power and converting it into heat. On a massive scale. For what?