The race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all. Ecc 9:11
Bitcoin is good for the economy because it encourages spending. It's better than having a electricity as a resource and not using it. Miners buy equipment which is income to the producer. Also increases employment in the power plant and the factory producing the equipment.
The high interest rate is for the high risk. If anyone who could qualify for a lower interest rate, wouldn't go and borrow at the higher interest rate.