Cartoon Network doesn't carry lots of japanese show because they are american! They rather make their own shows than license expensive foreign shows. Cartoon Network has a animation School in Argentina so I guess it's a better way to produce new content rather than import (mostly mediocre japanese with copy each other). Look at the powerpuff puff girl japanese edition, t's nothing compared with the original one, and guess which one is more expensive??
The japanese wannabe is FOX, but cheaper since most shows are donde in Korea and China, and THERE'S A BIG DIFFERENCE IN QUALITY. Also most of their shows are into the "collect something and use it against your enemies!" kind of marketing with cards and tons of toys, which are ok if the first product is good, unlike "Beyblade" and lots of others...
I guess I rather watch Transformers and Thundercats, for my toy filled animations...