Try using a deflationary currency for daily exchanges and see how it works out. Coins issued on top of a smart contract blockchain are a different story because they can be inflationary. The way it's goin, Ether will soon be just for gas. Crypto's real strength might just be the fact that we can issue tokens on chains that follow either a fixed inflation or adjusted for growth, essentially achieving what modern economic theory recommends, bur backed by code and thus not affected by corruption.