Could be the fillings: Around here fresh fruit with custard is a pretty standard grocery store filling, and that must be refrigerated. Also, a lot of people like whipped cream icing instead of "buttercream," so that must be refrigerated until just before serving as well. It all depends. Also, from a legal standpoint, many businesses will tell you that a cake has to be refrigerated simply to cover their a$$es legally speaking, lest there be even the slightest risk of spoilage/ food poisoning... this way if you don't refrigerate and it and someone gets sick they can say "well we told you so."
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