Could be a good idea if buyers could see prices in your local currency. Is there a plugin for this?
One of the disadvantages of Photoshelter is that you can only have one currency site-wide. We have ours set to US dollars, but the pricing popup doesn't make that clear, and the customisation options for that and the shopping cart are very limited. Inevitably a local buyer thought it was NZ$ and found PayPal taking a bigger bite out of their credit card than they expected. Whoops!
Buyer-switchable currencies would be great, but it has to be obvious what is being used.