I see you're Spanish, and so am I--how many times have you seen domains with accented letters? If I see one of those I automatically think I have to remove the accents before I type the URL in my browser.
Regarding countries that don't use latin letters, examples:
Regarding countries that don't use latin letters, examples:
http://www.alexa.com/topsites/countries/RU
http://www.alexa.com/topsites/countries/CN
http://www.alexa.com/topsites/countries/DZ