Just an argument to play devils advocate; I once had a conversation about comic book values with my Dad. He told me that if I can't walk into a comic book store and sell an issue "valued" by the price guide at $100 for $100, it isn't worth $100. Sure, we could unionize and standardize the price at $20k, but until they were selling at that price consistently (as opposed to just one poor schmuck who overpaid), then the value wouldn't be at that level.