Ooooh, old thread @.@
Anyway, I started liking J-pop because back then I was tired of all that American crap and wanted to listen to something refreshing and new, and then after I became an anime fan, I was pretty amazed by the opening/ending themes (especially from Inuyasha and Gravitation) at first, I wasn't sure why I listen to these kind of songs, they were in Japanese and I couldn't understand a thing, but in time I learned to just enjoy it and not worrying because of language barrier, especially that J-pop is pretty diverse and really addictive.
+ It makes me feel so special and unique that I'm one of the very very few in my country that listens to this kind of music and I myself can "promote" their music to my friends, family etc
I even have an account on our version of youtube and practically uploaded ayu's entire discography + several albums by other j-artists 