I read every reply to this thread. NO ONE has the answer yet, but I do. Funny enough, it has to do with the name of this forum.
People obsess over Anime...to escape.
To give the "Normal Fans" a break:
It became a giant entertainment genre because of the endless things you can do with animation (that would suck or wouldn't be possible to do in movies and shows with real people). The possibilities are endless, and to normal fans it's a cool alternative. I appreciate the Japanese culture, and their vast ideas for animation involving robots, demons, and boobs.
Anyways do you ever notice what the die-hard anime fans have in common? The first clue you should pick up is the most obvious, and that is they prefer Anime over most things. The beautifully drawn characters and stories appeal to them better than reality. It is an art they worship: of relations, cute creatures, action, emotion, etc. An alternative to living with bad hygiene, terrible work or family situations, and just an ugly world in general.
Admit it, Asia isn't pretty. soy sauce, slanted eyes, and bad teeth everywhere. This explains enough why they draw most of their characters as North American. The Asian (Also Mexican, African, and Brazilian) dream is practically to move to America/Europe and live the American dream of giant boobs, pretty people, pretty places, and too much food (i.e paradise).
If not go there, then at least bring the beautiful people and money back to the homeland.
To sum it up:
The people who obsess over Anime/ Games obviously love it, but most likely because they are broken souls yearning for a different world. I have yet to meet someone who is a hardcore fan who is yet "normal" in the head.