Sorry to submit yet another Bitcoin article, but this one turned out to be somewhat of a revelation for me. Thinking of bitcoins as digital collectibles seems a much better metaphor than thinking of them as money. Collectibles have a fixed supply, and their value depends on some concept that people are interested in. Consider e.g. Nazi memorabilia from WW2: fewer and fewer are discovered each year, the total supply is fixed, their value depends a lot on hobbyists' varying interest in WW2. Bitcoin is also unusual for a digital good in that it has a fixed supply, and its value depends a lot on enthusiasts who are interested in cryptocurrencies, fixed money supply etc.