The way I see it, the Ticket Exchange is there to facilitate transactions between CP community members.
Limiting the tickets to face values is a way to ensure only active members really use the exchange.
Once you allow people to sell above face, while not a big issue for people that are active members, you probably attract the "professionals" who are only here to sell tickets. They make a profit by taking advantage of the community Bingo et al have built, and didn't have to put in any time or effort or contributions to the community.
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