I paid £30 for a framed print and that sits on the wall doing nothing (it's resale value is probably a fiver on ebay), I have even bought a particularly pleasant rock on more than one occasion, pet or not. I have no use for them. Some are sat on the side because I like to look at the impressions of the creatures who died in it. Some are embedded in my wife's engagement ring (a pointless piece of bent metal), I'm not sure I get any value for them any more since we are married.
Why do we ascribe value to anything? I have a piece of paper in my wallet with a picture of the queen on. It's just a piece of paper, yet if I take it to the shop they will swap it for food! If I take it to the bank they will swap it for a number in a database (woop). Yet if I have a big number in that database or a lot of those special pictures I become a Big Man in society.
Yet, through no fault of my own, if I wanted to swap those pieces of paper for pieces with dead US presidents on, I would get 20% less than I would have 2 years ago! It would be worse but the value of dead-president-paper is not as high as it was. Holding Queen-paper or Dead-president-paper sounds like a huge risk.
