Mostly tourists? What are you getting at there? Anyone who is outside of their home town is a tourist and I'm sure the majority aren't out there making spontaneous technology purchases, especially in other countries that sell different power adapters and have different voltage requirements.
This is obviously just for the initial launch, there are so many different purchasing options that Apple is trying to prevent a lot of returned merchandise.
Most likely referring to Asians or Middle Eastern tourists to a Western country. There's a luxury outlet-type mall and the Asians in the summer time stroll that place with their suitcase to make sure all their purchases will fit into their luggage before flying back to Asia.