If they, or any server, wanted to steal your info they don't have to make up any story about decline. They could simply write down all the numbers, and the exp. date, and the security code from everyone in the restaurant. Not sure what the decline has to do with security. ?
I can't imagine that they care that much about cash sales since most places build in the price assuming the majority of customers pay by card and they have to pay the transaction costs. And if they are like most businesses, the more transactions they process there is less cost for each transaction (i.e. volume discount).
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