Interesting question: Do the price guides (Beckett, Tuff Stuff, Canadian Sports Collector, Sports Market Report) influence what you collect? Would you invest money on unlisted cards if you wanted them? I'm not talking about cards not listed due to scarcity, but rather cards from less popularly traded sets. For example, I like to collect cards of players pictured on their national teams. Many of these cards are not listed in price guides; not even as commons. So, do you bother with these cards even though they are seen as trash by most people, including the experts?