Mostly because very few country artists actually sell much outside the US and Canada, and it's usually just the ones who remix their music to be less country for international release that get airplay and sales overseas. That's why Shania's Come On Over album sold so well in Europe and elsewhere - the entire thing was remixed for release over there. (You can buy that version here too. I still need to get both versions on CD - my CD of COO is dying.)