> No other systems I know of are deliberately designed to continuously become less efficient. Well, there are - think of bcrypt :) It actually fits exactly th

> No other systems I know of are deliberately designed to continuously become less efficient. Well, there are - think of bcrypt :) It actually fits exactly the definition of design that deliberately becomes less efficient. Ultimately it's a matter of the perceived cost/benefit - encryption is deemed necessary, so the benefits [perceived] offset the costs, while the cryptocurrencies' benefits don't (or do, depending on the opinion).