"Too good to be true," is a warning we should heed when dealing with the current cryptocurrency craze. Cryptocurrency and the blockchain technology associated with it have uses. But when investors start trading irrationally we should make extra effort to encourage people to think about what they are investing in. A case point is the Steem Dollar, by definition it has a fixed value of one US Dollar, but people are clearly willing to exchange a ten dollar note for a one dollar coin. Too good to be true.