Those customers that are sold the domestic only cards are very clearly told that they are domestic only and customers can always apply for the international card as well. This is a way for the banks to give very low limit credit cards to customers who otherwise wouldn't have access to credit. It also protects the issuers from huge potential fraud losses. Trust me, those who have the domestic only cards are NOT going to be shopping in Knightsbridge, they are never even going to be getting on a plane.
People who those countries who want to be able to make overseas purchases and meet the credit requirements can get an international enabled card.
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I Love New York -- Viva Espaņa