Here, the dealer passes on savings, explicitly relies on goodwill, guarantees that his merchandise is as represented, and tries to cultivate repeat trade. Here, the object is to deceive a fellow player into believing that his or her relationship is a rare genuine instance of cooperation. I'm passing on these savings to you. If you make people believe that an item is a bargain, they will be more likely to buy it. The collector or investor can help cut losses by comparing notes with other collectors or investors who have dealt with the same firm.
Strategies differ according to who defines the payoffs.
Play is fair when all parties agree to the unequal payoffs and unfair when vital information is concealed, especially about subsequent changes in payoffs. More often, coin collecting and investing are played in finite-sum mode. Here the major issue is which strategies are being used and, in particular, what information is being withheld. Too often, regrettably, the tendency is to revert to the zero-sum mode. The poker mind-set has been applied for generations in politics and international diplomacy and more recently in coin dealing.