Actually, that's precisely the opposite of my point. To have value, an abstraction need not have "uses" in a pragmatic sense. It's easy to list some more comm

Actually, that's precisely the opposite of my point. To have value, an abstraction need not have "uses" in a pragmatic sense. It's easy to list some more common things of ascribed value that have no clear use: hobby collectables, keepsakes, Steam badges and other virtual commodities in video games, Xbox experience points, Ph.D. diplomas, etc. One simply needs to nucleate a community with some irrational desire for an abstraction of value to manifest extant value.