To me, Satoshi nails it here. For some reason, I don't know why, people seem to never consider collectability as a "use" that generates initial value. In fact, this is the whole point of Nick Szabo's paper Shelling Out on the origins of money as collectibles.

In the beginning, some Bitcoin users just wanted to collect bitcoins. They wanted to have a higher balance. I don't know why this is not considered a "use".