If you want to use a game analogy, use the Bartle taxonomy of player types (https://en.wikipedia.org/wiki/Bartle_taxonomy_of_player_types https://en.wikipedia.o

If you want to use a game analogy, use the Bartle taxonomy of player types (https://en.wikipedia.org/wiki/Bartle_taxonomy_of_player_types https://en.wikipedia.org/wiki/Bartle_taxonomy_of_player_type...): Socializers, Explorers, Achievers and Killers. Socializers enjoy talking about stamps, reading about stamps, engaging in online forums about stamps, etc. Explorers like to just find new stamps - anything new. Achievers want to maximize their stamps - all of a given time, given type, country, value, etc. Killers? Well that one I'm not so sure about. Maybe they just want to screw others out of good collections.