The European Union has regulated DCC transactions. It is no longer possible to claim that the transaction will use the "Mumbo Jumbo Bank wholesale rate" (or whatever) with no fee and then hide the fee in the exchange rate. It is now mandatory to present the fee in the form of the difference between the merchant's rate and the latest exchange rate posted by the European Central Bank. When I withdraw cash from a Nordea cash machine in Denmark last month, Nordea had to accurately report the conversion fee to SEK as five point something per cent. As the fees are now easier to spot, more people are likely to discover what a rip-off they are. Even if you don't discover this the first time, you will find out eventually. Unfortunately, merchants and banks only have to present an accurate exchange rate if the card is denominated in the currency of an EU/EEA country, so travellers from China, Russia, the United States and other places might not find out about the real fee.