well i think a lot people get them because they look better, its more visually pleasing to write something in japanese or chinese than in english, also you can represent a whole word with only one character. i think if the person knows what it means and has a reason for getting it, and they know that the kanji or whatever is correct! then i have no problem with it. someone said it was an abuse of the language if you don't speak it but take miyavi for example, he has the word UN-DO tattooed on him, and yes i realize that he now can mostly speak english but when he got it he was much younger and most likely didn't know english completely.
so that's just my opinion
