Polarbear: Paper is just a part of numismatics. There are people who collect (and deal in) virtually anything. A friend of mine collected beer cans (but would not drink the stuff). He had 400+ different cans, all empty, from all over the world. Another guy collected match books, and had several thousand different. In numismatics, coins are #1, followed by paper, tokens, military medals. Trends spends a lot of time on modern mint products and too little on paper, something I hope to correct in the future. A poor relative is stamps. It is hard to convince people that stamps are made to be used for mailing stuff, and have no face value.
Rick