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One problem I can think of is possible shrinkage as it's called in the industry. As it is right now all giftshop customers have to pass by the counter on their way out, making it easier for the gift shop crew to see any activity going on. If an alternate exit was put in then people could pick something up and wander out without second thought, and the gift shop volunteers might not catch it as easily, since a customer can completely avoid the counter. One remedy to this would be to have an entrance *only* on the north side of the building and essentially make the gift shop traffic one way, so everyone exits by moving past the counter.
More than one entrance and exit to the gift shop could open up other potential problems. It may seem like a choke point, but it works well.