[pkulak]

> Bitcoins are worthless.

So is the US dollar.

[bbcbasic]

To act as a good currency, the currency should be almost worthless (or worth a lot less than the value it represents).

USD and Bitcoin are both good currencies, in part because they are worthless.

To flip it on it's head - if a currency is worth more than the value it represents then no one would spend anything.