When my son was young, he used to collect hockey cards. He enjoyed tearing open a new package of cards to see what treasures it might contain, and spent many enjoyable hours organizing and viewing his collection. He had great binders full of cards, all sorted by team, and more binders for the doubles of his most valuable cards. All these are in a box gathering cobwebs in my attic today. At the time, though, they were very important to him. He would buy industry magazines that claimed to assign a value to each card. The value varied according to the prowess of the player, the ranking of the team,…