Originally Posted by cbn42

Perhaps that's exactly the reason. Merchants where the average transaction is higher and there are lots of foreign customers would benefit more, and are therefore more deliberate. If the benefit to the merchant is small, places where the average transaction is lower don't find it worthwhile to bother.

Here are some numbers from an Elavon merchant brochure:

• Bankcard Volume $375k
• Convertible (DCC) Volume $101k
• Payment Processing Bill $11,150
• DCC Merchant Rebate $755