Etsy now allows sellers to change the currency they list their items in, so I've gone ahead and done that. Now all items will be in British pounds, though shoppers can view the prices in dollars if they prefer. I'm doing this for two reasons:
1) to make it easier for me to keep my books. This way I don't have to do a currency conversion to figure out how much I made.
2) so I can be far more accurate on postage. That'll take a little time. I need to go through all my shipping profiles and fine tune them, but this way I don't make or lose any money on the postage I charge.
The change should be live in an hour.